diff --git a/CHANGELOG.md b/CHANGELOG.md
index e69de29b..13244043 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -0,0 +1 @@
+* Now using Firebase v9/compat
\ No newline at end of file
diff --git a/README.md b/README.md
index 8c681cab..ebd1fcfa 100644
--- a/README.md
+++ b/README.md
@@ -91,28 +91,17 @@ Install FirebaseUI and its peer-dependency Firebase via npm using the following
 commands:
 
 ```bash
-$ npm install firebase --save
-$ npm install firebaseui --save
+$ npm install firebase firebaseui --save
 ```
 
-You can then `require` the following modules within your source files:
+You can then `import` the following modules within your source files:
 
 ```javascript
-var firebase = require('firebase');
-var firebaseui = require('firebaseui');
-// or using ES6 imports:
+import firebase from 'firebase/compat/app';
 import * as firebaseui from 'firebaseui'
 import 'firebaseui/dist/firebaseui.css'
 ```
 
-Or include the required files in your HTML, if your HTTP Server serves the files
-within `node_modules/`:
-
-```html
-<script src="node_modules/firebaseui/dist/firebaseui.js"></script>
-<link type="text/css" rel="stylesheet" href="node_modules/firebaseui/dist/firebaseui.css" />
-```
-
 ### Option 3: Bower component
 
 Install FirebaseUI and its dependencies via Bower using the following command:
@@ -193,11 +182,11 @@ for a more in-depth example, showcasing a Single Page Application mode.
   <head>
     <meta charset="UTF-8">
     <title>Sample FirebaseUI App</title>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-app-compat.js"></script>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-auth-compat.js"></script>
     <!-- *******************************************************************************************
        * TODO(DEVELOPER): Paste the initialization snippet from this dialog box:
        * Firebase Console > Project Settings > Add App > Web.
-       * In addition, include the firebase-auth SDK:
-       * <script src="https://www.gstatic.com/firebasejs/[FIREBASE VERSION USED IN SNIPPET]/firebase-auth.js"></script> *
        ***************************************************************************************** -->
     <script src="https://www.gstatic.com/firebasejs/ui/5.0.0/firebase-ui-auth.js"></script>
     <link type="text/css" rel="stylesheet" href="https://www.gstatic.com/firebasejs/ui/5.0.0/firebase-ui-auth.css" />
@@ -268,6 +257,8 @@ Here is how you would track the Auth state across all your pages:
   <head>
     <meta charset="UTF-8">
     <title>Sample FirebaseUI App</title>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-app-compat.js"></script>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-auth-compat.js"></script>
     <!-- *******************************************************************************************
        * TODO(DEVELOPER): Paste the initialization snippet from:
        * Firebase Console > Overview > Add Firebase to your web app. *
@@ -1347,6 +1338,8 @@ FirebaseUI is displayed.
   <head>
     <meta charset="UTF-8">
     <title>Sample FirebaseUI App</title>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-app-compat.js"></script>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-auth-compat.js"></script>
     <!-- *******************************************************************************************
        * TODO(DEVELOPER): Paste the initialization snippet from:
        * Firebase Console > Overview > Add Firebase to your web app. *
@@ -1939,6 +1932,26 @@ can verify in the [demo app](https://fir-ui-demo-84a6c.firebaseapp.com/)).
 
 **For v1.0.0 and superior:** https://github.com/firebase/firebaseui-web/releases
 
+### 6.0.0
+
+FirebaseUI-web v6.0.0 is intended to be used alongside Firebase JS SDK v9 compat.
+
+If using the CDN, change your Firebase imports to:
+
+```html
+<script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-app-compat.js"></script>
+<script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-auth-compat.js"></script>
+```
+
+If NPM:
+
+```ts
+import firebase from 'firebase/compat/app';
+import 'firebase/compat/auth';
+```
+
+[See the Firebase upgrade guide for more information.](https://firebase.google.com/docs/web/modular-upgrade)
+
 ### 5.0.0
 
 `accountchooser.com` has been operating in "universal opt-out" mode and was
diff --git a/bower.json b/bower.json
index 4f4e06af..3b0c7317 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "firebaseui",
-  "version": "2.5.1",
+  "version": "6.0.0",
   "description": "Javascript library for customizable UI on top of Firebase SDK",
   "main": [
     "./dist/firebaseui.js",
@@ -22,6 +22,6 @@
     "out"
   ],
   "dependencies": {
-    "firebase": "^4.1.2"
+    "firebase": "^9.1.3"
   }
 }
diff --git a/buildtools/run_tests.sh b/buildtools/run_tests.sh
index 4cf8952c..7e3119ec 100755
--- a/buildtools/run_tests.sh
+++ b/buildtools/run_tests.sh
@@ -87,8 +87,8 @@ else
   echo "Using Headless Chrome."
   # Updates Selenium Webdriver.
   GOOGLE_CHROME_VERSION=$(google-chrome --product-version || echo 'latest')
-  echo "$PROTRACTOR_BIN_PATH/webdriver-manager update --versions.chrome $GOOGLE_CHROME_VERSION --gecko=false"
-  $PROTRACTOR_BIN_PATH/webdriver-manager update --versions.chrome $GOOGLE_CHROME_VERSION --gecko=false
+  echo "$PROTRACTOR_BIN_PATH/webdriver-manager update --versions.chrome=$GOOGLE_CHROME_VERSION --gecko=false"
+  $PROTRACTOR_BIN_PATH/webdriver-manager update --versions.chrome=$GOOGLE_CHROME_VERSION --gecko=false
   # Start Selenium Webdriver.
   echo "$PROTRACTOR_BIN_PATH/webdriver-manager start &>/dev/null &"
   $PROTRACTOR_BIN_PATH/webdriver-manager start &>/dev/null &
diff --git a/cut b/cut
new file mode 100644
index 00000000..e69de29b
diff --git a/demo/public/index.html b/demo/public/index.html
index 1901a06a..49fc13a8 100644
--- a/demo/public/index.html
+++ b/demo/public/index.html
@@ -4,7 +4,8 @@
     <meta charset="UTF-8">
     <title>FirebaseUI Auth Demo</title>
     <link rel="manifest" href="manifest.json">
-    <script src="https://www.gstatic.com/firebasejs/7.4.0/firebase.js"></script>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-app-compat.js"></script>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-auth-compat.js"></script>
     <script src="config.js"></script>
     <script src="common.js"></script>
     <link href="style.css" rel="stylesheet" type="text/css" media="screen" />
diff --git a/demo/public/widget.html b/demo/public/widget.html
index 786ebbf6..2bcdb51a 100644
--- a/demo/public/widget.html
+++ b/demo/public/widget.html
@@ -3,7 +3,8 @@
   <head>
     <meta charset="UTF-8">
     <title>FirebaseUI Auth Demo</title>
-    <script src="https://www.gstatic.com/firebasejs/7.4.0/firebase.js"></script>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-app-compat.js"></script>
+    <script src="https://www.gstatic.com/firebasejs/9.1.3/firebase-auth-compat.js"></script>
     <script src="config.js"></script>
     <script src="common.js"></script>
     <script src="dist/firebaseui.js"></script>
diff --git a/firebase-externs/firebase-app-externs.js b/firebase-externs/firebase-app-externs.js
new file mode 100644
index 00000000..06c5db98
--- /dev/null
+++ b/firebase-externs/firebase-app-externs.js
@@ -0,0 +1,293 @@
+/**
+ * @license Copyright 2017 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Firebase namespace and Firebase App API.
+ * @externs
+ */
+
+/**
+ * <code>firebase</code> is a global namespace from which all the Firebase
+ * services are accessed.
+ *
+ * @namespace
+ */
+var firebase = {};
+
+/**
+ * Creates and initializes a Firebase {@link firebase.app.App app} instance.
+ *
+ * See
+ * {@link
+ *   https://firebase.google.com/docs/web/setup#add_firebase_to_your_app
+ *   Add Firebase to your app} and
+ * {@link
+ *   https://firebase.google.com/docs/web/setup#initialize_multiple_apps
+ *   Initialize multiple apps} for detailed documentation.
+ *
+ * @example
+ * // Initialize default app
+ * // Retrieve your own options values by adding a web app on
+ * // https://console.firebase.google.com
+ * firebase.initializeApp({
+ *   apiKey: "AIza....",                             // Auth / General Use
+ *   authDomain: "YOUR_APP.firebaseapp.com",         // Auth with popup/redirect
+ *   databaseURL: "https://YOUR_APP.firebaseio.com", // Realtime Database
+ *   storageBucket: "YOUR_APP.appspot.com",          // Storage
+ *   messagingSenderId: "123456789"                  // Cloud Messaging
+ * });
+ *
+ * @example
+ * // Initialize another app
+ * var otherApp = firebase.initializeApp({
+ *   databaseURL: "https://<OTHER_DATABASE_NAME>.firebaseio.com",
+ *   storageBucket: "<OTHER_STORAGE_BUCKET>.appspot.com"
+ * }, "otherApp");
+ *
+ * @param {!Object} options Options to configure the app's services.
+ * @param {string=} name Optional name of the app to initialize. If no name
+ *   is provided, the default is `"[DEFAULT]"`.
+ *
+ * @return {!firebase.app.App} The initialized app.
+ */
+firebase.initializeApp = function (options, name) {};
+
+/**
+ * Retrieves a Firebase {@link firebase.app.App app} instance.
+ *
+ * When called with no arguments, the default app is returned. When an app name
+ * is provided, the app corresponding to that name is returned.
+ *
+ * An exception is thrown if the app being retrieved has not yet been
+ * initialized.
+ *
+ * @example
+ * // Return the default app
+ * var app = firebase.app();
+ *
+ * @example
+ * // Return a named app
+ * var otherApp = firebase.app("otherApp");
+ *
+ * @namespace
+ * @param {string=} name Optional name of the app to return. If no name is
+ *   provided, the default is `"[DEFAULT]"`.
+ *
+ * @return {!firebase.app.App} The app corresponding to the provided app name.
+ *   If no app name is provided, the default app is returned.
+ */
+firebase.app = function (name) {};
+
+/**
+ * A (read-only) array of all initialized apps.
+ * @type {!Array<firebase.app.App>}
+ */
+firebase.apps;
+
+/**
+ * The current SDK version.
+ * @type {string}
+ */
+firebase.SDK_VERSION;
+
+/**
+ * A Firebase App holds the initialization information for a collection of
+ * services.
+ *
+ * Do not call this constructor directly. Instead, use
+ * {@link firebase#.initializeApp `firebase.initializeApp()`} to create an app.
+ *
+ * @interface
+ */
+firebase.app.App = function () {};
+
+/**
+ * The (read-only) name for this app.
+ *
+ * The default app's name is `"[DEFAULT]"`.
+ *
+ * @example
+ * // The default app's name is "[DEFAULT]"
+ * firebase.initializeApp(defaultAppConfig);
+ * console.log(firebase.app().name);  // "[DEFAULT]"
+ *
+ * @example
+ * // A named app's name is what you provide to initializeApp()
+ * var otherApp = firebase.initializeApp(otherAppConfig, "other");
+ * console.log(otherApp.name);  // "other"
+ *
+ * @type {string}
+ */
+firebase.app.App.prototype.name;
+
+/**
+ * The (read-only) configuration options for this app. These are the original
+ * parameters given in
+ * {@link firebase#.initializeApp `firebase.initializeApp()`}.
+ *
+ * @example
+ * var app = firebase.initializeApp(config);
+ * console.log(app.options.databaseURL === config.databaseURL);  // true
+ *
+ * @type {!Object}
+ */
+firebase.app.App.prototype.options;
+
+/**
+ * Renders this app unusable and frees the resources of all associated
+ * services.
+ *
+ * @example
+ * app.delete()
+ *   .then(function() {
+ *     console.log("App deleted successfully");
+ *   })
+ *   .catch(function(error) {
+ *     console.log("Error deleting app:", error);
+ *   });
+ *
+ * @return {!firebase.Promise<void>} An empty promise fulfilled when the app has
+ *   been deleted.
+ */
+firebase.app.App.prototype.delete = function () {};
+
+/**
+ * A Thenable is the standard interface returned by a Promise.
+ *
+ * @template T
+ * @interface
+ */
+firebase.Thenable = function () {};
+
+/**
+ * Assign callback functions called when the Thenable value either
+ * resolves, or is rejected.
+ *
+ * @param {(function(T): *)=} onResolve Called when the Thenable resolves.
+ * @param {(function(!Error): *)=} onReject Called when the Thenable is rejected
+ *   (with an error).
+ * @return {!firebase.Thenable<*>}
+ */
+firebase.Thenable.prototype.then = function (onResolve, onReject) {};
+
+/**
+ * Assign a callback when the Thenable rejects.
+ *
+ * @param {(function(!Error): *)=} onReject Called when the Thenable is rejected
+ *   (with an error).
+ * @return {!firebase.Thenable<*>}
+ */
+firebase.Thenable.prototype.catch = function (onReject) {};
+
+/**
+ * A Promise represents an eventual (asynchronous) value. A Promise should
+ * (eventually) either resolve or reject. When it does, it will call all the
+ * callback functions that have been assigned via the <code>.then()</code> or
+ * <code>.catch()</code> methods.
+ *
+ * <code>firebase.Promise</code> is the same as the native Promise
+ * implementation when available in the current environment, otherwise it is a
+ * compatible implementation of the Promise/A+ spec.
+ *
+ * @template T
+ * @constructor
+ * @implements {firebase.Thenable}
+ * @param {function((function(T): void),
+ *                  (function(!Error): void))} resolver
+ */
+firebase.Promise = function (resolver) {};
+
+/**
+ * Assign callback functions called when the Promise either resolves, or is
+ * rejected.
+ *
+ * @param {(function(T): *)=} onResolve Called when the Promise resolves.
+ * @param {(function(!Error): *)=} onReject Called when the Promise is rejected
+ *   (with an error).
+ * @return {!firebase.Promise<*>}
+ * @override
+ */
+firebase.Promise.prototype.then = function (onResolve, onReject) {};
+
+/**
+ * Assign a callback when the Promise rejects.
+ *
+ * @param {(function(!Error): *)=} onReject Called when the Promise is rejected
+ *   (with an error).
+ * @override
+ */
+firebase.Promise.prototype.catch = function (onReject) {};
+
+/**
+ * Return a resolved Promise.
+ *
+ * @template T
+ * @param {T=} value The value to be returned by the Promise.
+ * @return {!firebase.Promise<T>}
+ */
+firebase.Promise.resolve = function (value) {};
+
+/**
+ * Return (an immediately) rejected Promise.
+ *
+ * @param {!Error} error The reason for the Promise being rejected.
+ * @return {!firebase.Promise<*>}
+ */
+firebase.Promise.reject = function (error) {};
+
+/**
+ * Convert an array of Promises, to a single array of values.
+ * <code>Promise.all()</code> resolves only after all the Promises in the array
+ * have resolved.
+ *
+ * <code>Promise.all()</code> rejects when any of the promises in the Array have
+ * rejected.
+ *
+ * @param {!Array<!firebase.Promise<*>>} values
+ * @return {!firebase.Promise<!Array<*>>}
+ */
+firebase.Promise.all = function (values) {};
+
+/**
+ * @template V, E
+ * @interface
+ **/
+firebase.Observer = function () {};
+
+/**
+ * @param {?V} value
+ */
+firebase.Observer.prototype.next = function (value) {};
+
+/**
+ * @param {!E} error
+ */
+firebase.Observer.prototype.error = function (error) {};
+
+firebase.Observer.prototype.complete = function () {};
+
+/** @typedef {function(): void} */
+firebase.CompleteFn;
+
+/** @typedef {function(): void} */
+firebase.Unsubscribe;
+
+/**
+ * @param {string} name
+ * @param {string} version
+ * @param {?string} variant
+ */
+firebase.registerVersion = function (name, version, variant) {};
diff --git a/firebase-externs/firebase-auth-externs.js b/firebase-externs/firebase-auth-externs.js
new file mode 100644
index 00000000..f286f66c
--- /dev/null
+++ b/firebase-externs/firebase-auth-externs.js
@@ -0,0 +1,3471 @@
+/**
+ * @license Copyright 2017 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Firebase Auth API.
+ * @externs
+ */
+
+/**
+ * Gets the {@link firebase.auth.Auth `Auth`} service for the default app or a
+ * given app.
+ *
+ * `firebase.auth()` can be called with no arguments to access the default app's
+ * {@link firebase.auth.Auth `Auth`} service or as `firebase.auth(app)` to
+ * access the {@link firebase.auth.Auth `Auth`} service associated with a
+ * specific app.
+ *
+ * @example
+ * // Get the Auth service for the default app
+ * var defaultAuth = firebase.auth();
+ *
+ * @example
+ * // Get the Auth service for a given app
+ * var otherAuth = firebase.auth(otherApp);
+ *
+ * @namespace
+ * @param {!firebase.app.App=} app
+ *
+ * @return {!firebase.auth.Auth}
+ */
+firebase.auth = function (app) {};
+
+/**
+ * Interface that represents the credentials returned by an auth provider.
+ * Implementations specify the details about each auth provider's credential
+ * requirements.
+ *
+ * @interface
+ */
+firebase.auth.AuthCredential = function () {};
+
+/**
+ * The authentication provider ID for the credential.
+ * For example, 'facebook.com', or 'google.com'.
+ *
+ * @type {string}
+ */
+firebase.auth.AuthCredential.prototype.providerId;
+
+/**
+ * The authentication sign in method for the credential.
+ * For example, 'password', or 'emailLink. This corresponds to the sign-in
+ * method identifier as returned in
+ * {@link firebase.auth.Auth#fetchSignInMethodsForEmail}.
+ *
+ * @type {string}
+ */
+firebase.auth.AuthCredential.prototype.signInMethod;
+
+/**
+ * Static method to deserialize a JSON representation of an object into an
+ * {@link firebase.auth.AuthCredential}. Input can be either Object or the
+ * stringified representation of the object. When string is provided,
+ * JSON.parse would be called first. If the JSON input does not represent an
+ * `AuthCredential`, null is returned.
+ * @param {string|!Object} json The plain object representation of an
+ *     AuthCredential.
+ * @return {?firebase.auth.AuthCredential} The auth credential.
+ */
+firebase.auth.AuthCredential.fromJSON = function (json) {};
+
+/**
+ * Returns a JSON-serializable representation of this object.
+ * @return {!Object} The plain object representation of the `AuthCredential`.
+ */
+firebase.auth.AuthCredential.prototype.toJSON = function () {};
+
+/**
+ * Defines the options for initializing an
+ * {@link firebase.auth.OAuthCredential}. For ID tokens with nonce claim,
+ * the raw nonce has to also be provided.
+ *
+ * @interface
+ */
+firebase.auth.OAuthCredentialOptions = function () {};
+
+/**
+ * The OAuth ID token used to initialize the OAuthCredential.
+ *
+ * @type {string|undefined}
+ */
+firebase.auth.OAuthCredentialOptions.prototype.idToken;
+
+/**
+ * The OAuth access token used to initialize the OAuthCredential.
+ *
+ * @type {string|undefined}
+ */
+firebase.auth.OAuthCredentialOptions.prototype.accessToken;
+
+/**
+ * The raw nonce associated with the ID token. It is required when an ID token
+ * with a nonce field is provided. The SHA-256 hash of the raw nonce must match
+ * the nonce field in the ID token.
+ *
+ * @type {string|undefined}
+ */
+firebase.auth.OAuthCredentialOptions.prototype.rawNonce;
+
+/**
+ * Interface that represents the OAuth credentials returned by an OAuth
+ * provider. Implementations specify the details about each auth provider's
+ * credential requirements.
+ *
+ * @interface
+ * @extends {firebase.auth.AuthCredential}
+ */
+firebase.auth.OAuthCredential = function () {};
+
+/**
+ * The OAuth ID token associated with the credential if it belongs to an
+ * OIDC provider, such as `google.com`.
+ *
+ * @type {?string|undefined}
+ */
+firebase.auth.OAuthCredential.prototype.idToken;
+
+/**
+ * The OAuth access token associated with the credential if it belongs to an
+ * OAuth provider, such as `facebook.com`, `twitter.com`, etc.
+ *
+ * @type {?string|undefined}
+ */
+firebase.auth.OAuthCredential.prototype.accessToken;
+
+/**
+ * The OAuth access token secret associated with the credential if it belongs
+ * to an OAuth 1.0 provider, such as `twitter.com`.
+ *
+ * @type {?string|undefined}
+ */
+firebase.auth.OAuthCredential.prototype.secret;
+
+/**
+ * Interface that represents the phone credentials returned by a phone provider.
+ *
+ * @interface
+ * @extends {firebase.auth.AuthCredential}
+ */
+firebase.auth.PhoneAuthCredential = function () {};
+
+/**
+ * Gets the {@link firebase.auth.Auth `Auth`} service for the current app.
+ *
+ * @example
+ * var auth = app.auth();
+ * // The above is shorthand for:
+ * // var auth = firebase.auth(app);
+ *
+ * @return {!firebase.auth.Auth}
+ */
+firebase.app.App.prototype.auth = function () {};
+
+/**
+ * Interface representing a user's metadata.
+ *
+ * @interface
+ */
+firebase.auth.UserMetadata = function () {};
+
+/**
+ * The date the user last signed in, formatted as a UTC string.
+ * For example, 'Fri, 22 Sep 2017 01:49:58 GMT'.
+ *
+ * @type {?string}
+ */
+firebase.auth.UserMetadata.prototype.lastSignInTime;
+
+/**
+ * The date the user was created, formatted as a UTC string.
+ * For example, 'Fri, 22 Sep 2017 01:49:58 GMT'.
+ *
+ * @type {?string}
+ */
+firebase.auth.UserMetadata.prototype.creationTime;
+
+/**
+ * User profile information, visible only to the Firebase project's
+ * apps.
+ *
+ * @interface
+ */
+firebase.UserInfo = function () {};
+
+/**
+ * The user's unique ID.
+ *
+ * @type {string}
+ */
+firebase.UserInfo.prototype.uid;
+
+/**
+ * The authentication provider ID for the current user.
+ * For example, 'facebook.com', or 'google.com'.
+ *
+ * @type {string}
+ */
+firebase.UserInfo.prototype.providerId;
+
+/**
+ * The user's email address (if available).
+ * @type {?string}
+ */
+firebase.UserInfo.prototype.email;
+
+/**
+ * The user's display name (if available).
+ *
+ * @type {?string}
+ */
+firebase.UserInfo.prototype.displayName;
+
+/**
+ * The URL of the user's profile picture (if available).
+ *
+ * @type {?string}
+ */
+firebase.UserInfo.prototype.photoURL;
+
+/**
+ * The user's E.164 formatted phone number (if available).
+ *
+ * @type {?string}
+ */
+firebase.UserInfo.prototype.phoneNumber;
+
+/**
+ * A user account.
+ *
+ * @interface
+ * @extends {firebase.UserInfo}
+ */
+firebase.User = function () {};
+
+/**
+ * The phone number normalized based on the E.164 standard (e.g. +16505550101)
+ * for the current user. This is null if the user has no phone credential linked
+ * to the account.
+ * @type {?string}
+ */
+firebase.User.prototype.phoneNumber;
+
+/** @type {boolean} */
+firebase.User.prototype.isAnonymous;
+
+/**
+ * True if the user's email address has been verified.
+ * @type {boolean}
+ */
+firebase.User.prototype.emailVerified;
+
+/**
+ * Additional metadata about the user.
+ * @type {!firebase.auth.UserMetadata}
+ */
+firebase.User.prototype.metadata;
+
+/**
+ * Additional provider-specific information about the user.
+ * @type {!Array<firebase.UserInfo>}
+ */
+firebase.User.prototype.providerData;
+
+/**
+ * A refresh token for the user account. Use only for advanced scenarios that
+ * require explicitly refreshing tokens.
+ * @type {string}
+ */
+firebase.User.prototype.refreshToken;
+
+/**
+ * The {@link firebase.User.MultiFactor} object corresponding to the current
+ * user. This is used to access all multi-factor properties and operations
+ * related to the current user.
+ * @type {!firebase.User.MultiFactorUser}
+ */
+firebase.User.prototype.multiFactor;
+
+/**
+ * The current user's tenant ID. This is a read-only property, which indicates
+ * the tenant ID used to sign in the current user. This is null if the user is
+ * signed in from the parent project.
+ *
+ * @example
+ * ```javascript
+ * // Set the tenant ID on Auth instance.
+ * firebase.auth().tenantId = ‘TENANT_PROJECT_ID’;
+ *
+ * // All future sign-in request now include tenant ID.
+ * firebase.auth().signInWithEmailAndPassword(email, password)
+ *   .then(function(result) {
+ *     // result.user.tenantId should be ‘TENANT_PROJECT_ID’.
+ *   }).catch(function(error) {
+ *     // Handle error.
+ *   });
+ * ```
+ * @type {?string}
+ */
+firebase.User.prototype.tenantId;
+
+/**
+ * Returns a JWT token used to identify the user to a Firebase service.
+ *
+ * Returns the current token if it has not expired, otherwise this will
+ * refresh the token and return a new one.
+ *
+ * @param {boolean=} forceRefresh Force refresh regardless of token
+ *     expiration.
+ * @return {!firebase.Promise<string>}
+ */
+firebase.User.prototype.getIdToken = function (forceRefresh) {};
+
+/**
+ * Refreshes the current user, if signed in.
+ *
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.reload = function () {};
+
+/**
+ * Sends a verification email to a user.
+ *
+ * The verification process is completed by calling
+ * {@link firebase.auth.Auth#applyActionCode}
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/missing-android-pkg-name</dt>
+ * <dd>An Android package name must be provided if the Android app is required
+ *     to be installed.</dd>
+ * <dt>auth/missing-continue-uri</dt>
+ * <dd>A continue URL must be provided in the request.</dd>
+ * <dt>auth/missing-ios-bundle-id</dt>
+ * <dd>An iOS bundle ID must be provided if an App Store ID is provided.</dd>
+ * <dt>auth/invalid-continue-uri</dt>
+ * <dd>The continue URL provided in the request is invalid.</dd>
+ * <dt>auth/unauthorized-continue-uri</dt>
+ * <dd>The domain of the continue URL is not whitelisted. Whitelist
+ *     the domain in the Firebase console.</dd>
+ * </dl>
+ *
+ * @example
+ * var actionCodeSettings = {
+ *   url: 'https://www.example.com/cart?email=user@example.com&cartId=123',
+ *   iOS: {
+ *     bundleId: 'com.example.ios'
+ *   },
+ *   android: {
+ *     packageName: 'com.example.android',
+ *     installApp: true,
+ *     minimumVersion: '12'
+ *   },
+ *   handleCodeInApp: true
+ * };
+ * firebase.auth().currentUser.sendEmailVerification(actionCodeSettings)
+ *     .then(function() {
+ *       // Verification email sent.
+ *     })
+ *     .catch(function(error) {
+ *       // Error occurred. Inspect error.code.
+ *     });
+ *
+ * @param {?firebase.auth.ActionCodeSettings=} actionCodeSettings The action
+ *     code settings. If specified, the state/continue URL will be set as the
+ *     "continueUrl" parameter in the email verification link. The default email
+ *     verification landing page will use this to display a link to go back to
+ *     the app if it is installed.
+ *     If the actionCodeSettings is not specified, no URL is appended to the
+ *     action URL.
+ *     The state URL provided must belong to a domain that is whitelisted by the
+ *     developer in the console. Otherwise an error will be thrown.
+ *     Mobile app redirects will only be applicable if the developer configures
+ *     and accepts the Firebase Dynamic Links terms of condition.
+ *     The Android package name and iOS bundle ID will be respected only if they
+ *     are configured in the same Firebase Auth project used.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.sendEmailVerification = function (
+  actionCodeSettings
+) {};
+
+/**
+ * Links the user account with the given credentials.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/provider-already-linked</dt>
+ * <dd>Thrown if the provider has already been linked to the user. This error is
+ *     thrown even if this is not the same provider's account that is currently
+ *     linked to the user.</dd>
+ * <dt>auth/invalid-credential</dt>
+ * <dd>Thrown if the provider's credential is not valid. This can happen if it
+ *     has already expired when calling link, or if it used invalid token(s).
+ *     See the Firebase documentation for your provider, and make sure you pass
+ *     in the correct parameters to the credential method.</dd>
+ * <dt>auth/credential-already-in-use</dt>
+ * <dd>Thrown if the account corresponding to the credential already exists
+ *     among your users, or is already linked to a Firebase User.
+ *     For example, this error could be thrown if you are upgrading an anonymous
+ *     user to a Google user by linking a Google credential to it and the Google
+ *     credential used is already associated with an existing Firebase Google
+ *     user.
+ *     The fields <code>error.email</code>, <code>error.phoneNumber</code>, and
+ *     <code>error.credential</code> ({@link firebase.auth.AuthCredential})
+ *     may be provided, depending on the type of credential. You can recover
+ *     from this error by signing in with <code>error.credential</code> directly
+ *     via {@link firebase.auth.Auth#signInWithCredential}.</dd>
+ * <dt>auth/email-already-in-use</dt>
+ * <dd>Thrown if the email corresponding to the credential already exists
+ *     among your users. When thrown while linking a credential to an existing
+ *     user, an <code>error.email</code> and <code>error.credential</code>
+ *     ({@link firebase.auth.AuthCredential}) fields are also provided.
+ *     You have to link the credential to the existing user with that email if
+ *     you wish to continue signing in with that credential. To do so, call
+ *     {@link firebase.auth.Auth#fetchSignInMethodsForEmail}, sign in to
+ *     <code>error.email</code> via one of the providers returned and then
+ *     {@link firebase.User#linkWithCredential} the original credential to that
+ *     newly signed in user.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if you have not enabled the provider in the Firebase Console. Go
+ *     to the Firebase Console for your project, in the Auth section and the
+ *     <strong>Sign in Method</strong> tab and configure the provider.</dd>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email used in a
+ *     {@link firebase.auth.EmailAuthProvider#credential} is invalid.</dd>
+ * <dt>auth/wrong-password</dt>
+ * <dd>Thrown if the password used in a
+ *     {@link firebase.auth.EmailAuthProvider#credential} is not correct or
+ *     when the user associated with the email does not have a password.</dd>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential} and the verification
+ *     code of the credential is not valid.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential}  and the verification
+ *     ID of the credential is not valid.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.AuthCredential} credential The auth credential.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.User.prototype.linkWithCredential = function (credential) {};
+
+/**
+ * Links the user account with the given credentials, and returns any available
+ * additional user information, such as user name.
+ *
+ * This method is deprecated. Use
+ * {@link firebase.User#linkWithCredential} instead.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/provider-already-linked</dt>
+ * <dd>Thrown if the provider has already been linked to the user. This error is
+ *     thrown even if this is not the same provider's account that is currently
+ *     linked to the user.</dd>
+ * <dt>auth/invalid-credential</dt>
+ * <dd>Thrown if the provider's credential is not valid. This can happen if it
+ *     has already expired when calling link, or if it used invalid token(s).
+ *     See the Firebase documentation for your provider, and make sure you pass
+ *     in the correct parameters to the credential method.</dd>
+ * <dt>auth/credential-already-in-use</dt>
+ * <dd>Thrown if the account corresponding to the credential already exists
+ *     among your users, or is already linked to a Firebase User.
+ *     For example, this error could be thrown if you are upgrading an anonymous
+ *     user to a Google user by linking a Google credential to it and the Google
+ *     credential used is already associated with an existing Firebase Google
+ *     user.
+ *     The fields <code>error.email</code>, <code>error.phoneNumber</code>, and
+ *     <code>error.credential</code> ({@link firebase.auth.AuthCredential})
+ *     may be provided, depending on the type of credential. You can recover
+ *     from this error by signing in with <code>error.credential</code> directly
+ *     via {@link firebase.auth.Auth#signInWithCredential}.</dd>
+ * <dt>auth/email-already-in-use</dt>
+ * <dd>Thrown if the email corresponding to the credential already exists
+ *     among your users. When thrown while linking a credential to an existing
+ *     user, an <code>error.email</code> and <code>error.credential</code>
+ *     ({@link firebase.auth.AuthCredential}) fields are also provided.
+ *     You have to link the credential to the existing user with that email if
+ *     you wish to continue signing in with that credential. To do so, call
+ *     {@link firebase.auth.Auth#fetchSignInMethodsForEmail}, sign in to
+ *     <code>error.email</code> via one of the providers returned and then
+ *     {@link firebase.User#linkWithCredential} the original credential to that
+ *     newly signed in user.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if you have not enabled the provider in the Firebase Console. Go
+ *     to the Firebase Console for your project, in the Auth section and the
+ *     <strong>Sign in Method</strong> tab and configure the provider.</dd>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email used in a
+ *     {@link firebase.auth.EmailAuthProvider#credential} is invalid.</dd>
+ * <dt>auth/wrong-password</dt>
+ * <dd>Thrown if the password used in a
+ *     {@link firebase.auth.EmailAuthProvider#credential} is not correct or
+ *     when the user associated with the email does not have a password.</dd>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential} and the verification
+ *     code of the credential is not valid.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential}  and the verification
+ *     ID of the credential is not valid.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.AuthCredential} credential The auth credential.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.User.prototype.linkAndRetrieveDataWithCredential = function (
+  credential
+) {};
+
+/**
+ * Links the user account with the given phone number.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/provider-already-linked</dt>
+ * <dd>Thrown if the provider has already been linked to the user. This error is
+ *     thrown even if this is not the same provider's account that is currently
+ *     linked to the user.</dd>
+ * <dt>auth/captcha-check-failed</dt>
+ * <dd>Thrown if the reCAPTCHA response token was invalid, expired, or if
+ *     this method was called from a non-whitelisted domain.</dd>
+ * <dt>auth/invalid-phone-number</dt>
+ * <dd>Thrown if the phone number has an invalid format.</dd>
+ * <dt>auth/missing-phone-number</dt>
+ * <dd>Thrown if the phone number is missing.</dd>
+ * <dt>auth/quota-exceeded</dt>
+ * <dd>Thrown if the SMS quota for the Firebase project has been exceeded.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given phone number has been
+ *     disabled.</dd>
+ * <dt>auth/credential-already-in-use</dt>
+ * <dd>Thrown if the account corresponding to the phone number already exists
+ *     among your users, or is already linked to a Firebase User.
+ *     The fields <code>error.phoneNumber</code> and
+ *     <code>error.credential</code> ({@link firebase.auth.AuthCredential})
+ *     are provided in this case. You can recover from this error by signing in
+ *     with that credential directly via
+ *     {@link firebase.auth.Auth#signInWithCredential}.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if you have not enabled the phone authentication provider in the
+ *     Firebase Console. Go to the Firebase Console for your project, in the
+ *     Auth section and the <strong>Sign in Method</strong> tab and configure
+ *     the provider.</dd>
+ * </dl>
+ *
+ * @param {string} phoneNumber The user's phone number in E.164 format (e.g.
+ *     +16505550101).
+ * @param {!firebase.auth.ApplicationVerifier} applicationVerifier
+ * @return {!firebase.Promise<!firebase.auth.ConfirmationResult>}
+ */
+firebase.User.prototype.linkWithPhoneNumber = function (
+  phoneNumber,
+  applicationVerifier
+) {};
+
+/**
+ * Unlinks a provider from a user account.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/no-such-provider</dt>
+ * <dd>Thrown if the user does not have this provider linked or when the
+ *     provider ID given does not exist.</dd>
+ * </dt>
+ *
+ * @param {string} providerId
+ * @return {!firebase.Promise<!firebase.User>}
+ */
+firebase.User.prototype.unlink = function (providerId) {};
+
+/**
+ * Re-authenticates a user using a fresh credential. Use before operations
+ * such as {@link firebase.User#updatePassword} that require tokens from recent
+ * sign-in attempts.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/user-mismatch</dt>
+ * <dd>Thrown if the credential given does not correspond to the user.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if the credential given does not correspond to any existing user.
+ *     </dd>
+ * <dt>auth/invalid-credential</dt>
+ * <dd>Thrown if the provider's credential is not valid. This can happen if it
+ *     has already expired when calling link, or if it used invalid token(s).
+ *     See the Firebase documentation for your provider, and make sure you pass
+ *     in the correct parameters to the credential method.</dd>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email used in a
+ *     {@link firebase.auth.EmailAuthProvider#credential} is invalid.</dd>
+ * <dt>auth/wrong-password</dt>
+ * <dd>Thrown if the password used in a
+ *     {@link firebase.auth.EmailAuthProvider#credential} is not correct or when
+ *     the user associated with the email does not have a password.</dd>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential} and the verification
+ *     code of the credential is not valid.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential}  and the verification
+ *     ID of the credential is not valid.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.AuthCredential} credential
+ * @return {!firebase.Promise<firebase.auth.UserCredential>}
+ */
+firebase.User.prototype.reauthenticateWithCredential = function (credential) {};
+
+/**
+ * Re-authenticates a user using a fresh credential, and returns any available
+ * additional user information, such as user name. Use before operations
+ * such as {@link firebase.User#updatePassword} that require tokens from recent
+ * sign-in attempts.
+ *
+ * This method is deprecated. Use
+ * {@link firebase.User#reauthenticateWithCredential} instead.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/user-mismatch</dt>
+ * <dd>Thrown if the credential given does not correspond to the user.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if the credential given does not correspond to any existing user.
+ *     </dd>
+ * <dt>auth/invalid-credential</dt>
+ * <dd>Thrown if the provider's credential is not valid. This can happen if it
+ *     has already expired when calling link, or if it used invalid token(s).
+ *     See the Firebase documentation for your provider, and make sure you pass
+ *     in the correct parameters to the credential method.</dd>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email used in a
+ *     {@link firebase.auth.EmailAuthProvider#credential} is invalid.</dd>
+ * <dt>auth/wrong-password</dt>
+ * <dd>Thrown if the password used in a
+ *     {@link firebase.auth.EmailAuthProvider#credential} is not correct or when
+ *     the user associated with the email does not have a password.</dd>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential} and the verification
+ *     code of the credential is not valid.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential}  and the verification
+ *     ID of the credential is not valid.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.AuthCredential} credential
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.User.prototype.reauthenticateAndRetrieveDataWithCredential = function (
+  credential
+) {};
+
+/**
+ * Re-authenticates a user using a fresh credential. Use before operations
+ * such as {@link firebase.User#updatePassword} that require tokens from recent
+ * sign-in attempts.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/user-mismatch</dt>
+ * <dd>Thrown if the credential given does not correspond to the user.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if the credential given does not correspond to any existing user.
+ *     </dd>
+ * <dt>auth/captcha-check-failed</dt>
+ * <dd>Thrown if the reCAPTCHA response token was invalid, expired, or if
+ *     this method was called from a non-whitelisted domain.</dd>
+ * <dt>auth/invalid-phone-number</dt>
+ * <dd>Thrown if the phone number has an invalid format.</dd>
+ * <dt>auth/missing-phone-number</dt>
+ * <dd>Thrown if the phone number is missing.</dd>
+ * <dt>auth/quota-exceeded</dt>
+ * <dd>Thrown if the SMS quota for the Firebase project has been exceeded.</dd>
+ * </dl>
+ *
+ * @param {string} phoneNumber The user's phone number in E.164 format (e.g.
+ *     +16505550101).
+ * @param {!firebase.auth.ApplicationVerifier} applicationVerifier
+ * @return {!firebase.Promise<!firebase.auth.ConfirmationResult>}
+ */
+firebase.User.prototype.reauthenticateWithPhoneNumber = function (
+  phoneNumber,
+  applicationVerifier
+) {};
+
+/**
+ * Updates the user's email address.
+ *
+ * An email will be sent to the original email address (if it was set) that
+ * allows to revoke the email address change, in order to protect them from
+ * account hijacking.
+ *
+ * <b>Important:</b> this is a security sensitive operation that requires the
+ * user to have recently signed in. If this requirement isn't met, ask the user
+ * to authenticate again and then call
+ * {@link firebase.User#reauthenticateWithCredential}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email used is invalid.</dd>
+ * <dt>auth/email-already-in-use</dt>
+ * <dd>Thrown if the email is already used by another user.</dd>
+ * <dt>auth/requires-recent-login</dt>
+ * <dd>Thrown if the user's last sign-in time does not meet the security
+ *     threshold. Use {@link firebase.User#reauthenticateWithCredential} to
+ *     resolve. This does not apply if the user is anonymous.</dd>
+ * </dl>
+ *
+ * @param {string} newEmail The new email address.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.updateEmail = function (newEmail) {};
+
+/**
+ * Updates the user's password.
+ *
+ * <b>Important:</b> this is a security sensitive operation that requires the
+ * user to have recently signed in. If this requirement isn't met, ask the user
+ * to authenticate again and then call
+ * {@link firebase.User#reauthenticateWithCredential}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/weak-password</dt>
+ * <dd>Thrown if the password is not strong enough.</dd>
+ * <dt>auth/requires-recent-login</dt>
+ * <dd>Thrown if the user's last sign-in time does not meet the security
+ *     threshold. Use {@link firebase.User#reauthenticateWithCredential} to
+ *     resolve. This does not apply if the user is anonymous.</dd>
+ * </dl>
+ *
+ * @param {string} newPassword
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.updatePassword = function (newPassword) {};
+
+/**
+ * Updates the user's phone number.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the verification code of the credential is not valid.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the verification ID of the credential is not valid.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.AuthCredential} phoneCredential
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.updatePhoneNumber = function (phoneCredential) {};
+
+/**
+ * Updates a user's profile data.
+ *
+ * @example
+ * // Updates the user attributes:
+ * user.updateProfile({
+ *   displayName: "Jane Q. User",
+ *   photoURL: "https://example.com/jane-q-user/profile.jpg"
+ * }).then(function() {
+ *   // Profile updated successfully!
+ *   // "Jane Q. User"
+ *   var displayName = user.displayName;
+ *   // "https://example.com/jane-q-user/profile.jpg"
+ *   var photoURL = user.photoURL;
+ * }, function(error) {
+ *   // An error happened.
+ * });
+ *
+ * // Passing a null value will delete the current attribute's value, but not
+ * // passing a property won't change the current attribute's value:
+ * // Let's say we're using the same user than before, after the update.
+ * user.updateProfile({photoURL: null}).then(function() {
+ *   // Profile updated successfully!
+ *   // "Jane Q. User", hasn't changed.
+ *   var displayName = user.displayName;
+ *   // Now, this is null.
+ *   var photoURL = user.photoURL;
+ * }, function(error) {
+ *   // An error happened.
+ * });
+ *
+ * @param {!{displayName: ?string, photoURL: ?string}} profile The profile's
+ *     displayName and photoURL to update.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.updateProfile = function (profile) {};
+
+/**
+ * Sends a verification email to a new email address. The user's email will be
+ * updated to the new one after being verified.
+ *
+ * If you have a custom email action handler, you can complete the verification
+ * process by calling {@link firebase.auth.Auth.applyActionCode}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/missing-android-pkg-name</dt>
+ * <dd>An Android package name must be provided if the Android app is required
+ *     to be installed.</dd>
+ * <dt>auth/missing-continue-uri</dt>
+ * <dd>A continue URL must be provided in the request.</dd>
+ * <dt>auth/missing-ios-bundle-id</dt>
+ * <dd>An iOS bundle ID must be provided if an App Store ID is provided.</dd>
+ * <dt>auth/invalid-continue-uri</dt>
+ * <dd>The continue URL provided in the request is invalid.</dd>
+ * <dt>auth/unauthorized-continue-uri</dt>
+ * <dd>The domain of the continue URL is not whitelisted. Whitelist
+ *     the domain in the Firebase console.</dd>
+ * </dl>
+ *
+ * @example
+ * ```javascript
+ * var actionCodeSettings = {
+ *   url: 'https://www.example.com/cart?email=user@example.com&cartId=123',
+ *   iOS: {
+ *     bundleId: 'com.example.ios'
+ *   },
+ *   android: {
+ *     packageName: 'com.example.android',
+ *     installApp: true,
+ *     minimumVersion: '12'
+ *   },
+ *   handleCodeInApp: true
+ * };
+ * firebase.auth().currentUser.verifyBeforeUpdateEmail(
+ *   'user@example.com', actionCodeSettings)
+ *   .then(function() {
+ *     // Verification email sent.
+ *   })
+ *   .catch(function(error) {
+ *     // Error occurred. Inspect error.code.
+ *   });
+ * ```
+ *
+ * @param {string} newEmail The email address to be verified and updated to.
+ * @param {?firebase.auth.ActionCodeSettings=} actionCodeSettings The action
+ *     code settings. If specified, the state/continue URL will be set as the
+ *     "continueUrl" parameter in the email verification link. The default email
+ *     verification landing page will use this to display a link to go back to
+ *     the app if it is installed.
+ *     If the actionCodeSettings is not specified, no URL is appended to the
+ *     action URL.
+ *     The state URL provided must belong to a domain that is whitelisted by the
+ *     developer in the console. Otherwise an error will be thrown.
+ *     Mobile app redirects will only be applicable if the developer configures
+ *     and accepts the Firebase Dynamic Links terms of condition.
+ *     The Android package name and iOS bundle ID will be respected only if they
+ *     are configured in the same Firebase Auth project used.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.verifyBeforeUpdateEmail = function (
+  newEmail,
+  actionCodeSettings
+) {};
+
+/**
+ * Deletes and signs out the user.
+ *
+ * <b>Important:</b> this is a security sensitive operation that requires the
+ * user to have recently signed in. If this requirement isn't met, ask the user
+ * to authenticate again and then call
+ * {@link firebase.User#reauthenticateWithCredential}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/requires-recent-login</dt>
+ * <dd>Thrown if the user's last sign-in time does not meet the security
+ *     threshold. Use {@link firebase.User#reauthenticateWithCredential} to
+ *     resolve. This does not apply if the user is anonymous.</dd>
+ * </dl>
+ *
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.delete = function () {};
+
+/**
+ * Returns a JSON-serializable representation of this object.
+ *
+ * @return {!Object} A JSON-serializable representation of this object.
+ */
+firebase.User.prototype.toJSON = function () {};
+
+/**
+ * The Firebase Auth service interface.
+ *
+ * Do not call this constructor directly. Instead, use
+ * {@link firebase.auth `firebase.auth()`}.
+ *
+ * See
+ * {@link https://firebase.google.com/docs/auth/ Firebase Authentication}
+ * for a full guide on how to use the Firebase Auth service.
+ *
+ * @interface
+ */
+firebase.auth.Auth = function () {};
+
+/**
+ * Checks a password reset code sent to the user by email or other out-of-band
+ * mechanism.
+ *
+ * Returns the user's email address if valid.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/expired-action-code</dt>
+ * <dd>Thrown if the password reset code has expired.</dd>
+ * <dt>auth/invalid-action-code</dt>
+ * <dd>Thrown if the password reset code is invalid. This can happen if the code
+ *     is malformed or has already been used.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given password reset code has
+ *     been disabled.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if there is no user corresponding to the password reset code. This
+ *     may have happened if the user was deleted between when the code was
+ *     issued and when this method was called.</dd>
+ * </dl>
+ *
+ * @param {string} code A verification code sent to the user.
+ * @return {!firebase.Promise<string>}
+ */
+firebase.auth.Auth.prototype.verifyPasswordResetCode = function (code) {};
+
+/**
+ * A response from {@link firebase.auth.Auth#checkActionCode}.
+ *
+ * @interface
+ */
+firebase.auth.ActionCodeInfo = function () {};
+
+/**
+ * The data associated with the action code.
+ *
+ * For the `PASSWORD_RESET`, `VERIFY_EMAIL`, and `RECOVER_EMAIL` actions, this
+ * object contains an `email` field with the address the email was sent to.
+ *
+ * For the RECOVER_EMAIL action, which allows a user to undo an email address
+ * change, this object also contains a `previousEmail` field with the user
+ * account's current email address. After the action completes, the user's
+ * email address will revert to the value in the `email` field from the value
+ * in `previousEmail` field.
+ *
+ * For the VERIFY_AND_CHANGE_EMAIL action, which allows a user to verify the
+ * email before updating it, this object contains a `previousEmail` field with
+ * the user account's email address before updating. After the action completes,
+ * the user's email address will be updated to the value in the `email` field
+ * from the value in `previousEmail` field.
+ *
+ * For the REVERT_SECOND_FACTOR_ADDITION action, which allows a user to unenroll
+ * a newly added second factor, this object contains a `multiFactorInfo` field
+ * with the information about the second factor. For phone second factor, the
+ * `multiFactorInfo` is a {@link firebase.auth.Auth.PhoneMultiFactorInfo}
+ * object, which contains the phone number.
+ *
+ * @typedef {{
+ *   email: (?string|undefined),
+ *   fromEmail: (?string|undefined),
+ *   multiFactorInfo: (?firebase.auth.MultiFactorInfo|undefined),
+     previousEmail: (?string|undefined)
+ * }}
+ */
+firebase.auth.ActionCodeInfo.prototype.data;
+
+/**
+ * The type of operation that generated the action code. This could be:
+ * <ul>
+ * <li>`EMAIL_SIGNIN`: email sign in code generated via
+ *     {@link firebase.auth.Auth.sendSignInLinkToEmail}.</li>
+ * <li>`PASSWORD_RESET`: password reset code generated via
+ *     {@link firebase.auth.Auth.sendPasswordResetEmail}.</li>
+ * <li>`RECOVER_EMAIL`: email change revocation code generated via
+ *     {@link firebase.User.updateEmail}.</li>
+ * <li>`REVERT_SECOND_FACTOR_ADDITION`: revert second factor addition
+ *     code generated via
+ *     {@link firebase.User.MultiFactorUser.enroll}.</li>
+ * <li>`VERIFY_AND_CHANGE_EMAIL`: verify and change email code generated
+ *     via {@link firebase.User.verifyBeforeUpdateEmail}.</li>
+ * <li>`VERIFY_EMAIL`: email verification code generated via
+ *     {@link firebase.User.sendEmailVerification}.</li>
+ * </ul>
+ *
+ * @type {string}
+ */
+firebase.auth.ActionCodeInfo.prototype.operation;
+
+/**
+ * @enum {string}
+ * An enumeration of the possible email action types.
+ */
+firebase.auth.ActionCodeInfo.Operation = {
+  /**
+   * The email link sign in email action.
+   */
+  EMAIL_SIGNIN: 'EMAIL_SIGNIN',
+  /**
+   * The reset password email action.
+   */
+  PASSWORD_RESET: 'PASSWORD_RESET',
+  /**
+   * The email revocation action.
+   */
+  RECOVER_EMAIL: 'RECOVER_EMAIL',
+  /**
+   * The revert second factor addition email action.
+   */
+  REVERT_SECOND_FACTOR_ADDITION: 'REVERT_SECOND_FACTOR_ADDITION',
+  /**
+   * The verify and update email action.
+   */
+  VERIFY_AND_CHANGE_EMAIL: 'VERIFY_AND_CHANGE_EMAIL',
+  /**
+   * The email verification action.
+   */
+  VERIFY_EMAIL: 'VERIFY_EMAIL'
+};
+
+/**
+ * A utility class to parse email action URLs.
+ *
+ * @constructor
+ */
+firebase.auth.ActionCodeURL = function () {};
+
+/**
+ * The API key of the email action link.
+ *
+ * @type {string}
+ */
+firebase.auth.ActionCodeURL.prototype.apiKey;
+
+/**
+ * The action code of the email action link.
+ *
+ * @type {string}
+ */
+firebase.auth.ActionCodeURL.prototype.code;
+
+/**
+ * The continue URL of the email action link. Null if not provided.
+ *
+ * @type {?string}
+ */
+firebase.auth.ActionCodeURL.prototype.continueUrl;
+
+/**
+ * The language code of the email action link. Null if not provided.
+ *
+ * @type {?string}
+ */
+firebase.auth.ActionCodeURL.prototype.languageCode;
+
+/**
+ * The action performed by the email action link. It returns from one
+ * of the types from {@link firebase.auth.ActionCodeInfo}.
+ *
+ * @type {!firebase.auth.ActionCodeInfo.Operation}
+ */
+firebase.auth.ActionCodeURL.prototype.operation;
+
+/**
+ * The tenant ID of the email action link. Null if the email action
+ * is from the parent project.
+ *
+ * @type {?string}
+ */
+firebase.auth.ActionCodeURL.prototype.tenantId;
+
+/**
+ * Parses the email action link string and returns an ActionCodeURL object
+ * if the link is valid, otherwise returns null.
+ *
+ * @param {string} link The email action link string.
+ * @return {?firebase.auth.ActionCodeURL} The ActionCodeURL object, or null if
+ *     the link is invalid.
+ */
+firebase.auth.ActionCodeURL.parseLink = function (link) {};
+
+/**
+ * This is the interface that defines the required continue/state URL with
+ * optional Android and iOS bundle identifiers.
+ * The action code setting fields are:
+ * <ul>
+ * <li><p>url: Sets the link continue/state URL, which has different meanings
+ *     in different contexts:</p>
+ *     <ul>
+ *     <li>When the link is handled in the web action widgets, this is the deep
+ *         link in the continueUrl query parameter.</li>
+ *     <li>When the link is handled in the app directly, this is the continueUrl
+ *         query parameter in the deep link of the Dynamic Link.</li>
+ *     </ul>
+ *     </li>
+ * <li>iOS: Sets the iOS bundle ID. This will try to open the link in an iOS app
+ *     if it is installed.</li>
+ * <li>android: Sets the Android package name. This will try to open the link in
+ *     an android app if it is installed. If installApp is passed, it specifies
+ *     whether to install the Android app if the device supports it and the app
+ *     is not already installed. If this field is provided without a
+ *     packageName, an error is thrown explaining that the packageName must be
+ *     provided in conjunction with this field.
+ *     If minimumVersion is specified, and an older version of the app is
+ *     installed, the user is taken to the Play Store to upgrade the app.</li>
+ * <li>handleCodeInApp: The default is false. When set to true, the action code
+ *     link will be be sent as a Universal Link or Android App Link and will be
+ *     opened by the app if installed. In the false case, the code will be sent
+ *     to the web widget first and then on continue will redirect to the app if
+ *     installed.</li>
+ * </ul>
+ *
+ * @typedef {{
+ *   url: string,
+ *   iOS: ({bundleId: string}|undefined),
+ *   android: ({packageName: string, installApp: (boolean|undefined),
+ *              minimumVersion: (string|undefined)}|undefined),
+ *   handleCodeInApp: (boolean|undefined)
+ * }}
+ */
+firebase.auth.ActionCodeSettings;
+
+/**
+ * Checks a verification code sent to the user by email or other out-of-band
+ * mechanism.
+ *
+ * Returns metadata about the code.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/expired-action-code</dt>
+ * <dd>Thrown if the action code has expired.</dd>
+ * <dt>auth/invalid-action-code</dt>
+ * <dd>Thrown if the action code is invalid. This can happen if the code is
+ *     malformed or has already been used.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given action code has been
+ *     disabled.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if there is no user corresponding to the action code. This may
+ *     have happened if the user was deleted between when the action code was
+ *     issued and when this method was called.</dd>
+ * </dl>
+ *
+ * @param {string} code A verification code sent to the user.
+ * @return {!firebase.Promise<!firebase.auth.ActionCodeInfo>}
+ */
+firebase.auth.Auth.prototype.checkActionCode = function (code) {};
+
+/**
+ * Applies a verification code sent to the user by email or other out-of-band
+ * mechanism.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/expired-action-code</dt>
+ * <dd>Thrown if the action code has expired.</dd>
+ * <dt>auth/invalid-action-code</dt>
+ * <dd>Thrown if the action code is invalid. This can happen if the code is
+ *     malformed or has already been used.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given action code has been
+ *     disabled.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if there is no user corresponding to the action code. This may
+ *     have happened if the user was deleted between when the action code was
+ *     issued and when this method was called.</dd>
+ * </dl>
+ *
+ * @param {string} code A verification code sent to the user.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.auth.Auth.prototype.applyActionCode = function (code) {};
+
+/**
+ * The {@link firebase.app.App app} associated with the `Auth` service
+ * instance.
+ *
+ * @example
+ * var app = auth.app;
+ *
+ * @type {!firebase.app.App}
+ */
+firebase.auth.Auth.prototype.app;
+
+/**
+ * The currently signed-in user (or null).
+ *
+ * @type {firebase.User|null}
+ */
+firebase.auth.Auth.prototype.currentUser;
+
+/**
+ * The full emulator configuration as set on `auth().emulatorConfig`.
+ * <ul>
+ * <li>protocol: the protocol used by the emulator (http or https).</li>
+ * <li>host: the host used to reach the emulator.</li>
+ * <li>port: the port used to reach the emulator.</li>
+ * <li>options: a list of options used to configure the SDK's interaction with
+ * the emulator.</li>
+ * </ul>
+ *
+ * @typedef {{
+ *   protocol: string,
+ *   host: string,
+ *   port: (number|null),
+ *   options: {
+ *     disableWarnings: boolean,
+ *   }
+ * }}
+ */
+firebase.auth.EmulatorConfig;
+
+/**
+ * The current emulator configuration, or null if not set.
+ *
+ * @type {firebase.auth.EmulatorConfig|null}
+ */
+firebase.auth.Auth.prototype.emulatorConfig;
+
+/**
+ * Configures the SDK to communicate with the Firebase Auth emulator.
+ *
+ * This must be called before any other Auth SDK actions are taken.
+ *
+ * Options can include `disableWarnings`. When set to true, the SDK will not
+ * display a warning banner at the bottom of the page.
+ *
+ * @param {string} url The full emulator url including scheme and port.
+ * @param {!Object=} options Options for configuring the SDK's emulator config.
+ */
+firebase.auth.Auth.prototype.useEmulator = function (url, options) {};
+
+/**
+ * The current Auth instance's tenant ID. This is a readable/writable
+ * property. When you set the tenant ID of an Auth instance, all future
+ * sign-in/sign-up operations will pass this tenant ID and sign in or
+ * sign up users to the specified tenant project.
+ * When set to null, users are signed in to the parent project. By default,
+ * this is set to null.
+ *
+ * @example
+ * ```javascript
+ * // Set the tenant ID on Auth instance.
+ * firebase.auth().tenantId = ‘TENANT_PROJECT_ID’;
+ *
+ * // All future sign-in request now include tenant ID.
+ * firebase.auth().signInWithEmailAndPassword(email, password)
+ *   .then(function(result) {
+ *     // result.user.tenantId should be ‘TENANT_PROJECT_ID’.
+ *   }).catch(function(error) {
+ *     // Handle error.
+ *   });
+ * ```
+ *
+ * @type {?string}
+ */
+firebase.auth.Auth.prototype.tenantId;
+
+/**
+ * @enum {string}
+ * An enumeration of the possible persistence mechanism types.
+ */
+firebase.auth.Auth.Persistence = {
+  /**
+   * Indicates that the state will be persisted even when the browser window is
+   * closed or the activity is destroyed in react-native.
+   */
+  LOCAL: 'local',
+  /**
+   * Indicates that the state will only be stored in memory and will be cleared
+   * when the window or activity is refreshed.
+   */
+  NONE: 'none',
+  /**
+   * Indicates that the state will only persist in current session/tab, relevant
+   * to web only, and will be cleared when the tab is closed.
+   */
+  SESSION: 'session'
+};
+
+/**
+ * Changes the current type of persistence on the current Auth instance for the
+ * currently saved Auth session and applies this type of persistence for
+ * future sign-in requests, including sign-in with redirect requests. This will
+ * return a promise that will resolve once the state finishes copying from one
+ * type of storage to the other.
+ * Calling a sign-in method after changing persistence will wait for that
+ * persistence change to complete before applying it on the new Auth state.
+ *
+ * This makes it easy for a user signing in to specify whether their session
+ * should be remembered or not. It also makes it easier to never persist the
+ * Auth state for applications that are shared by other users or have sensitive
+ * data.
+ *
+ * The default for web browser apps and React Native apps is 'local' (provided
+ * the browser supports this mechanism) whereas it is 'none' for Node.js backend
+ * apps.
+ *
+ * <h4>Error Codes (thrown synchronously)</h4>
+ * <dl>
+ * <dt>auth/invalid-persistence-type</dt>
+ * <dd>Thrown if the specified persistence type is invalid.</dd>
+ * <dt>auth/unsupported-persistence-type</dt>
+ * <dd>Thrown if the current environment does not support the specified
+ *     persistence type.</dd>
+ * </dl>
+ *
+ * @example
+ * firebase.auth().setPersistence(firebase.auth.Auth.Persistence.SESSION)
+ *     .then(function() {
+ *   // Existing and future Auth states are now persisted in the current
+ *   // session only. Closing the window would clear any existing state even if
+ *   // a user forgets to sign out.
+ * });
+ *
+ * @param {!firebase.auth.Auth.Persistence} persistence The auth state
+ *     persistence mechanism.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.auth.Auth.prototype.setPersistence = function (persistence) {};
+
+/**
+ * The current Auth instance's language code. This is a readable/writable
+ * property. When set to null, the default Firebase Console language setting
+ * is applied. The language code will propagate to email action templates
+ * (password reset, email verification and email change revocation), SMS
+ * templates for phone authentication, reCAPTCHA verifier and OAuth
+ * popup/redirect operations provided the specified providers support
+ * localization with the language code specified.
+ *
+ * @type {?string}
+ */
+firebase.auth.Auth.prototype.languageCode;
+
+/**
+ * Sets the current language to the default device/browser preference.
+ */
+firebase.auth.Auth.prototype.useDeviceLanguage = function () {};
+
+/**
+ * The current Auth instance's settings. This is used to edit/read configuration
+ * related options like app verification mode for phone authentication.
+ *
+ * @type {!firebase.auth.AuthSettings}
+ */
+firebase.auth.Auth.prototype.settings;
+
+/**
+ * Creates a new user account associated with the specified email address and
+ * password.
+ *
+ * On successful creation of the user account, this user will also be
+ * signed in to your application.
+ *
+ * User account creation can fail if the account already exists or the password
+ * is invalid.
+ *
+ * Note: The email address acts as a unique identifier for the user and
+ * enables an email-based password reset.  This function will create
+ * a new user account and set the initial user password.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/email-already-in-use</dt>
+ * <dd>Thrown if there already exists an account with the given email
+ *     address.</dd>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email address is not valid.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if email/password accounts are not enabled. Enable email/password
+ *     accounts in the Firebase Console, under the Auth tab.</dd>
+ * <dt>auth/weak-password</dt>
+ * <dd>Thrown if the password is not strong enough.</dd>
+ * </dl>
+ *
+ * @example
+ * firebase.auth().createUserWithEmailAndPassword(email, password)
+ *     .catch(function(error) {
+ *   // Handle Errors here.
+ *   var errorCode = error.code;
+ *   var errorMessage = error.message;
+ *   if (errorCode == 'auth/weak-password') {
+ *     alert('The password is too weak.');
+ *   } else {
+ *     alert(errorMessage);
+ *   }
+ *   console.log(error);
+ * });
+ *
+ * @param {string} email The user's email address.
+ * @param {string} password The user's chosen password.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.createUserWithEmailAndPassword = function (
+  email,
+  password
+) {};
+
+/**
+ * Gets the list of possible sign in methods for the given email address. This
+ * is useful to differentiate methods of sign-in for the same provider,
+ * eg. `EmailAuthProvider` which has 2 methods of sign-in, email/password and
+ * email/link.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email address is not valid.</dd>
+ * </dl>
+ *
+ * @param {string} email An email address.
+ * @return {!firebase.Promise<!Array<string>>}
+ */
+firebase.auth.Auth.prototype.fetchSignInMethodsForEmail = function (email) {};
+
+/**
+ * Checks if an incoming link is a sign-in with email link.
+ *
+ * @param {string} emailLink Sign-in email link.
+ * @return {boolean} Whether the link is a sign-in with email link.
+ */
+firebase.auth.Auth.prototype.isSignInWithEmailLink = function (emailLink) {};
+
+/**
+ * Adds an observer for changes to the user's sign-in state.
+ *
+ * Prior to 4.0.0, this triggered the observer when users were signed in,
+ * signed out, or when the user's ID token changed in situations such as token
+ * expiry or password change. After 4.0.0, the observer is only triggered
+ * on sign-in or sign-out.
+ *
+ * To keep the old behavior, see {@link firebase.auth.Auth#onIdTokenChanged}.
+ *
+ * @example
+ * firebase.auth().onAuthStateChanged(function(user) {
+ *   if (user) {
+ *     // User is signed in.
+ *   }
+ * });
+ *
+ * @param {!firebase.Observer<firebase.User, firebase.auth.Error>|function(?firebase.User)}
+ *     nextOrObserver An observer object or a function triggered on change.
+ * @param {function(!firebase.auth.Error)=} error Optional A function
+ *     triggered on auth error.
+ * @param {firebase.CompleteFn=} completed Optional A function triggered when the
+ *     observer is removed.
+ * @return {!firebase.Unsubscribe} The unsubscribe function for the observer.
+ */
+firebase.auth.Auth.prototype.onAuthStateChanged = function (
+  nextOrObserver,
+  error,
+  completed
+) {};
+
+/**
+ * Adds an observer for changes to the signed-in user's ID token, which includes
+ * sign-in, sign-out, and token refresh events. This method has the same
+ * behavior as {@link firebase.auth.Auth#onAuthStateChanged} had prior to 4.0.0.
+ *
+ * @example
+ * firebase.auth().onIdTokenChanged(function(user) {
+ *   if (user) {
+ *     // User is signed in or token was refreshed.
+ *   }
+ * });
+ *
+ * @param {!firebase.Observer<firebase.User, firebase.auth.Error>|function(?firebase.User)}
+ *     nextOrObserver An observer object or a function triggered on change.
+ * @param {function(!firebase.auth.Error)=} error Optional A function
+ *     triggered on auth error.
+ * @param {firebase.CompleteFn=} completed Optional A function triggered when the
+ *     observer is removed.
+ * @return {!firebase.Unsubscribe} The unsubscribe function for the observer.
+ */
+firebase.auth.Auth.prototype.onIdTokenChanged = function (
+  nextOrObserver,
+  error,
+  completed
+) {};
+
+/**
+ * Sends a sign-in email link to the user with the specified email.
+ *
+ * The sign-in operation has to always be completed in the app unlike other out
+ * of band email actions (password reset and email verifications). This is
+ * because, at the end of the flow, the user is expected to be signed in and
+ * their Auth state persisted within the app.
+ *
+ * To complete sign in with the email link, call
+ * {@link firebase.auth.Auth#signInWithEmailLink} with the email address and
+ * the email link supplied in the email sent to the user.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/argument-error</dt>
+ * <dd>Thrown if handleCodeInApp is false.</dd>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email address is not valid.</dd>
+ * <dt>auth/missing-android-pkg-name</dt>
+ * <dd>An Android package name must be provided if the Android app is required
+ *     to be installed.</dd>
+ * <dt>auth/missing-continue-uri</dt>
+ * <dd>A continue URL must be provided in the request.</dd>
+ * <dt>auth/missing-ios-bundle-id</dt>
+ * <dd>An iOS Bundle ID must be provided if an App Store ID is provided.</dd>
+ * <dt>auth/invalid-continue-uri</dt>
+ * <dd>The continue URL provided in the request is invalid.</dd>
+ * <dt>auth/unauthorized-continue-uri</dt>
+ * <dd>The domain of the continue URL is not whitelisted. Whitelist
+ *     the domain in the Firebase console.</dd>
+ * </dl>
+ *
+ * @example
+ * var actionCodeSettings = {
+ *   // The URL to redirect to for sign-in completion. This is also the deep
+ *   // link for mobile redirects. The domain (www.example.com) for this URL
+ *   // must be whitelisted in the Firebase Console.
+ *   url: 'https://www.example.com/finishSignUp?cartId=1234',
+ *   iOS: {
+ *     bundleId: 'com.example.ios'
+ *   },
+ *   android: {
+ *     packageName: 'com.example.android',
+ *     installApp: true,
+ *     minimumVersion: '12'
+ *   },
+ *   // This must be true.
+ *   handleCodeInApp: true
+ * };
+ * firebase.auth().sendSignInLinkToEmail('user@example.com', actionCodeSettings)
+ *     .then(function() {
+ *       // The link was successfully sent. Inform the user. Save the email
+ *       // locally so you don't need to ask the user for it again if they open
+ *       // the link on the same device.
+ *     })
+ *     .catch(function(error) {
+ *       // Some error occurred, you can inspect the code: error.code
+ *     });
+ *
+ * @param {string} email The email account to sign in with.
+ * @param {!firebase.auth.ActionCodeSettings} actionCodeSettings The action
+ *     code settings. The action code settings which provides Firebase with
+ *     instructions on how to construct the email link. This includes the
+ *     sign in completion URL or the deep link for mobile redirects, the mobile
+ *     apps to use when the sign-in link is opened on an Android or iOS device.
+ *     Mobile app redirects will only be applicable if the developer configures
+ *     and accepts the Firebase Dynamic Links terms of condition.
+ *     The Android package name and iOS bundle ID will be respected only if they
+ *     are configured in the same Firebase Auth project used.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.auth.Auth.prototype.sendSignInLinkToEmail = function (
+  email,
+  actionCodeSettings
+) {};
+
+/**
+ * Sends a password reset email to the given email address.
+ *
+ * To complete the password reset, call
+ * {@link firebase.auth.Auth#confirmPasswordReset} with the code supplied in the
+ * email sent to the user, along with the new password specified by the user.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email address is not valid.</dd>
+ * <dt>auth/missing-android-pkg-name</dt>
+ * <dd>An Android package name must be provided if the Android app is required
+ *     to be installed.</dd>
+ * <dt>auth/missing-continue-uri</dt>
+ * <dd>A continue URL must be provided in the request.</dd>
+ * <dt>auth/missing-ios-bundle-id</dt>
+ * <dd>An iOS Bundle ID must be provided if an App Store ID is provided.</dd>
+ * <dt>auth/invalid-continue-uri</dt>
+ * <dd>The continue URL provided in the request is invalid.</dd>
+ * <dt>auth/unauthorized-continue-uri</dt>
+ * <dd>The domain of the continue URL is not whitelisted. Whitelist
+ *     the domain in the Firebase console.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if there is no user corresponding to the email address.</dd>
+ * </dl>
+ *
+ * @example
+ * var actionCodeSettings = {
+ *   url: 'https://www.example.com/?email=user@example.com',
+ *   iOS: {
+ *     bundleId: 'com.example.ios'
+ *   },
+ *   android: {
+ *     packageName: 'com.example.android',
+ *     installApp: true,
+ *     minimumVersion: '12'
+ *   },
+ *   handleCodeInApp: true
+ * };
+ * firebase.auth().sendPasswordResetEmail(
+ *     'user@example.com', actionCodeSettings)
+ *     .then(function() {
+ *       // Password reset email sent.
+ *     })
+ *     .catch(function(error) {
+ *       // Error occurred. Inspect error.code.
+ *     });
+ *
+ * @param {string} email The email address with the password to be reset.
+ * @param {?firebase.auth.ActionCodeSettings=} actionCodeSettings The action
+ *     code settings. If specified, the state/continue URL will be set as the
+ *     "continueUrl" parameter in the password reset link. The default password
+ *     reset landing page will use this to display a link to go back to the app
+ *     if it is installed.
+ *     If the actionCodeSettings is not specified, no URL is appended to the
+ *     action URL.
+ *     The state URL provided must belong to a domain that is whitelisted by the
+ *     developer in the console. Otherwise an error will be thrown.
+ *     Mobile app redirects will only be applicable if the developer configures
+ *     and accepts the Firebase Dynamic Links terms of condition.
+ *     The Android package name and iOS bundle ID will be respected only if they
+ *     are configured in the same Firebase Auth project used.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.auth.Auth.prototype.sendPasswordResetEmail = function (
+  email,
+  actionCodeSettings
+) {};
+
+/**
+ * Completes the password reset process, given a confirmation code and new
+ * password.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/expired-action-code</dt>
+ * <dd>Thrown if the password reset code has expired.</dd>
+ * <dt>auth/invalid-action-code</dt>
+ * <dd>Thrown if the password reset code is invalid. This can happen if the
+ *     code is malformed or has already been used.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given password reset code has
+ *     been disabled.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if there is no user corresponding to the password reset code. This
+ *     may have happened if the user was deleted between when the code was
+ *     issued and when this method was called.</dd>
+ * <dt>auth/weak-password</dt>
+ * <dd>Thrown if the new password is not strong enough.</dd>
+ * </dl>
+ *
+ * @param {string} code The confirmation code send via email to the user.
+ * @param {string} newPassword The new password.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.auth.Auth.prototype.confirmPasswordReset = function (
+  code,
+  newPassword
+) {};
+
+/**
+ * Asynchronously signs in with the given credentials.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/account-exists-with-different-credential</dt>
+ * <dd>Thrown if there already exists an account with the email address
+ *     asserted by the credential. Resolve this by calling
+ *     {@link firebase.auth.Auth#fetchSignInMethodsForEmail} and then asking the
+ *     user to sign in using one of the returned providers. Once the user is
+ *     signed in, the original credential can be linked to the user with
+ *     {@link firebase.User#linkWithCredential}.</dd>
+ * <dt>auth/invalid-credential</dt>
+ * <dd>Thrown if the credential is malformed or has expired.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if the type of account corresponding to the credential
+ *     is not enabled. Enable the account type in the Firebase Console, under
+ *     the Auth tab.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given credential has been
+ *     disabled.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if signing in with a credential from
+ *     {@link firebase.auth.EmailAuthProvider#credential} and there is no user
+ *     corresponding to the given email. </dd>
+ * <dt>auth/wrong-password</dt>
+ * <dd>Thrown if signing in with a credential from
+ *     {@link firebase.auth.EmailAuthProvider#credential} and the password is
+ *     invalid for the given email, or if the account corresponding to the email
+ *     does not have a password set.</dd>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential} and the verification
+ *     code of the credential is not valid.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential}  and the verification
+ *     ID of the credential is not valid.</dd>
+ * </dl>
+ *
+ * @example
+ * firebase.auth().signInWithCredential(credential).catch(function(error) {
+ *   // Handle Errors here.
+ *   var errorCode = error.code;
+ *   var errorMessage = error.message;
+ *   // The email of the user's account used.
+ *   var email = error.email;
+ *   // The firebase.auth.AuthCredential type that was used.
+ *   var credential = error.credential;
+ *   if (errorCode === 'auth/account-exists-with-different-credential') {
+ *     alert('Email already associated with another account.');
+ *     // Handle account linking here, if using.
+ *   } else {
+ *     console.error(error);
+ *   }
+ *  });
+ *
+ * @param {!firebase.auth.AuthCredential} credential The auth credential.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.signInWithCredential = function (credential) {};
+
+/**
+ * Asynchronously signs in with the given credentials, and returns any available
+ * additional user information, such as user name.
+ *
+ * This method is deprecated. Use
+ * {@link firebase.auth.Auth#signInWithCredential} instead.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/account-exists-with-different-credential</dt>
+ * <dd>Thrown if there already exists an account with the email address
+ *     asserted by the credential. Resolve this by calling
+ *     {@link firebase.auth.Auth#fetchSignInMethodsForEmail} and then asking the
+ *     user to sign in using one of the returned providers. Once the user is
+ *     signed in, the original credential can be linked to the user with
+ *     {@link firebase.User#linkWithCredential}.</dd>
+ * <dt>auth/invalid-credential</dt>
+ * <dd>Thrown if the credential is malformed or has expired.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if the type of account corresponding to the credential
+ *     is not enabled. Enable the account type in the Firebase Console, under
+ *     the Auth tab.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given credential has been
+ *     disabled.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if signing in with a credential from
+ *     {@link firebase.auth.EmailAuthProvider#credential} and there is no user
+ *     corresponding to the given email. </dd>
+ * <dt>auth/wrong-password</dt>
+ * <dd>Thrown if signing in with a credential from
+ *     {@link firebase.auth.EmailAuthProvider#credential} and the password is
+ *     invalid for the given email, or if the account corresponding to the email
+ *     does not have a password set.</dd>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential} and the verification
+ *     code of the credential is not valid.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider#credential}  and the verification
+ *     ID of the credential is not valid.</dd>
+ * </dl>
+ *
+ * @example
+ * firebase.auth().signInAndRetrieveDataWithCredential(credential)
+ *     .then(function(userCredential) {
+ *       console.log(userCredential.additionalUserInfo.username);
+ *     });
+ *
+ * @param {!firebase.auth.AuthCredential} credential The auth credential.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.signInAndRetrieveDataWithCredential = function (
+  credential
+) {};
+
+/**
+ * Asynchronously signs in using a custom token.
+ *
+ * Custom tokens are used to integrate Firebase Auth with existing auth systems,
+ * and must be generated by the auth backend.
+ *
+ * Fails with an error if the token is invalid, expired, or not accepted by the
+ * Firebase Auth service.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/custom-token-mismatch</dt>
+ * <dd>Thrown if the custom token is for a different Firebase App.</dd>
+ * <dt>auth/invalid-custom-token</dt>
+ * <dd>Thrown if the custom token format is incorrect.</dd>
+ * </dl>
+ *
+ * @example
+ * firebase.auth().signInWithCustomToken(token).catch(function(error) {
+ *   // Handle Errors here.
+ *   var errorCode = error.code;
+ *   var errorMessage = error.message;
+ *   if (errorCode === 'auth/invalid-custom-token') {
+ *     alert('The token you provided is not valid.');
+ *   } else {
+ *     console.error(error);
+ *   }
+ * });
+ *
+ * @param {string} token The custom token to sign in with.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.signInWithCustomToken = function (token) {};
+
+/**
+ * Asynchronously signs in using an email and password.
+ *
+ * Fails with an error if the email address and password do not match.
+ *
+ * Note: The user's password is NOT the password used to access the user's email
+ * account. The email address serves as a unique identifier for the user, and
+ * the password is used to access the user's account in your Firebase project.
+ *
+ * See also: {@link firebase.auth.Auth#createUserWithEmailAndPassword}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email address is not valid.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given email has been
+ *     disabled.</dd>
+ * <dt>auth/user-not-found</dt>
+ * <dd>Thrown if there is no user corresponding to the given email.</dd>
+ * <dt>auth/wrong-password</dt>
+ * <dd>Thrown if the password is invalid for the given email, or the account
+ *     corresponding to the email does not have a password set.</dd>
+ * </dl>
+ *
+ * @example
+ * firebase.auth().signInWithEmailAndPassword(email, password)
+ *     .catch(function(error) {
+ *   // Handle Errors here.
+ *   var errorCode = error.code;
+ *   var errorMessage = error.message;
+ *   if (errorCode === 'auth/wrong-password') {
+ *     alert('Wrong password.');
+ *   } else {
+ *     alert(errorMessage);
+ *   }
+ *   console.log(error);
+ * });
+ *
+ * @param {string} email The users email address.
+ * @param {string} password The users password.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.signInWithEmailAndPassword = function (
+  email,
+  password
+) {};
+
+/**
+ * Asynchronously signs in using an email and sign-in email link. If no link
+ * is passed, the link is inferred from the current URL.
+ *
+ * Fails with an error if the email address is invalid or OTP in email link
+ * expires.
+ *
+ * Note: Confirm the link is a sign-in email link before calling this method
+ * {@link firebase.auth.Auth#isSignInWithEmailLink}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/expired-action-code</dt>
+ * <dd>Thrown if OTP in email link expires.</dd>
+ * <dt>auth/invalid-email</dt>
+ * <dd>Thrown if the email address is not valid.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given email has been
+ *     disabled.</dd>
+ * </dl>
+ *
+ * @example
+ * firebase.auth().signInWithEmailLink(email, emailLink)
+ *     .catch(function(error) {
+ *       // Some error occurred, you can inspect the code: error.code
+ *       // Common errors could be invalid email and invalid or expired OTPs.
+ *     });
+ *
+ * @param {string} email The email account to sign in with.
+ * @param {?string=} emailLink The optional link which contains the OTP needed
+ *     to complete the sign in with email link. If not specified, the current
+ *     URL is used instead.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.signInWithEmailLink = function (
+  email,
+  emailLink
+) {};
+
+/**
+ * Asynchronously signs in using a phone number. This method sends a code via
+ * SMS to the given phone number, and returns a
+ * {@link firebase.auth.ConfirmationResult}. After the user provides the code
+ * sent to their phone, call {@link firebase.auth.ConfirmationResult#confirm}
+ * with the code to sign the user in.
+ *
+ * For abuse prevention, this method also requires a
+ * {@link firebase.auth.ApplicationVerifier}. The Firebase Auth SDK includes
+ * a reCAPTCHA-based implementation, {@link firebase.auth.RecaptchaVerifier}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/captcha-check-failed</dt>
+ * <dd>Thrown if the reCAPTCHA response token was invalid, expired, or if
+ *     this method was called from a non-whitelisted domain.</dd>
+ * <dt>auth/invalid-phone-number</dt>
+ * <dd>Thrown if the phone number has an invalid format.</dd>
+ * <dt>auth/missing-phone-number</dt>
+ * <dd>Thrown if the phone number is missing.</dd>
+ * <dt>auth/quota-exceeded</dt>
+ * <dd>Thrown if the SMS quota for the Firebase project has been exceeded.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given phone number has been
+ *     disabled.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if you have not enabled the provider in the Firebase Console. Go
+ *     to the Firebase Console for your project, in the Auth section and the
+ *     <strong>Sign in Method</strong> tab and configure the provider.</dd>
+ * </dl>
+ *
+ * @example
+ * // 'recaptcha-container' is the ID of an element in the DOM.
+ * var applicationVerifier = new firebase.auth.RecaptchaVerifier(
+ *     'recaptcha-container');
+ * firebase.auth().signInWithPhoneNumber(phoneNumber, applicationVerifier)
+ *     .then(function(confirmationResult) {
+ *       var verificationCode = window.prompt('Please enter the verification ' +
+ *           'code that was sent to your mobile device.');
+ *       return confirmationResult.confirm(verificationCode);
+ *     })
+ *     .catch(function(error) {
+ *       // Handle Errors here.
+ *     });
+ *
+ * @param {string} phoneNumber The user's phone number in E.164 format (e.g.
+ *     +16505550101).
+ * @param {!firebase.auth.ApplicationVerifier} applicationVerifier
+ * @return {!firebase.Promise<!firebase.auth.ConfirmationResult>}
+ */
+firebase.auth.Auth.prototype.signInWithPhoneNumber = function (
+  phoneNumber,
+  applicationVerifier
+) {};
+
+/**
+ * A result from a phone number sign-in, link, or reauthenticate call.
+ * @interface
+ */
+firebase.auth.ConfirmationResult = function () {};
+
+/**
+ * The phone number authentication operation's verification ID. This can be used
+ * along with the verification code to initialize a phone auth credential.
+ *
+ * @type {string}
+ */
+firebase.auth.ConfirmationResult.prototype.verificationId;
+
+/**
+ * Finishes a phone number sign-in, link, or reauthentication, given the code
+ * that was sent to the user's mobile device.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the verification code is not valid.</dd>
+ * <dt>auth/missing-verification-code</dt>
+ * <dd>Thrown if the verification code is missing.</dd>
+ * </dl>
+ * @param {string} verificationCode
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.ConfirmationResult.prototype.confirm = function (
+  verificationCode
+) {};
+
+/**
+ * Asynchronously signs in as an anonymous user.
+ *
+ *
+ * If there is already an anonymous user signed in, that user will be returned;
+ * otherwise, a new anonymous user identity will be created and returned.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if anonymous accounts are not enabled. Enable anonymous accounts
+ *     in the Firebase Console, under the Auth tab.</dd>
+ * </dl>
+ *
+ * @example
+ * firebase.auth().signInAnonymously().catch(function(error) {
+ *   // Handle Errors here.
+ *   var errorCode = error.code;
+ *   var errorMessage = error.message;
+ *
+ *   if (errorCode === 'auth/operation-not-allowed') {
+ *     alert('You must enable Anonymous auth in the Firebase Console.');
+ *   } else {
+ *     console.error(error);
+ *   }
+ * });
+ *
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.signInAnonymously = function () {};
+
+/**
+ * Asynchronously sets the provided user as `currentUser` on the current Auth
+ * instance. A new instance copy of the user provided will be made and set as
+ * `currentUser`.
+ *
+ * This will trigger {@link firebase.auth.Auth#onAuthStateChanged} and
+ * {@link firebase.auth.Auth#onIdTokenChanged} listeners like other sign in
+ * methods.
+ *
+ * The operation fails with an error if the user to be updated belongs to a
+ * different Firebase project.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-user-token</dt>
+ * <dd>Thrown if the user to be updated belongs to a diffent Firebase
+ *     project.</dd>
+ * <dt>auth/user-token-expired</dt>
+ * <dd>Thrown if the token of the user to be updated is expired.</dd>
+ * <dt>auth/null-user</dt>
+ * <dd>Thrown if the user to be updated is null.</dd>
+ * <dt>auth/tenant-id-mismatch</dt>
+ * <dd>Thrown if the provided user's tenant ID does not match the
+ *     underlying Auth instance's configured tenant ID</dd>
+ * </dl>
+ *
+ * @param {?firebase.User} user
+ * @return {!firebase.Promise<void>}
+ */
+firebase.auth.Auth.prototype.updateCurrentUser = function (user) {};
+
+/**
+ * A structure containing a User, an AuthCredential, the operationType, and
+ * any additional user information that was returned from the identity provider.
+ * operationType could be 'signIn' for a sign-in operation, 'link' for a linking
+ * operation and 'reauthenticate' for a reauthentication operation.
+ *
+ * @typedef {{
+ *   user: ?firebase.User,
+ *   credential: ?firebase.auth.AuthCredential,
+ *   operationType: (?string|undefined),
+ *   additionalUserInfo: (?firebase.auth.AdditionalUserInfo|undefined)
+ * }}
+ */
+firebase.auth.UserCredential;
+
+/**
+ * A structure containing additional user information from a federated identity
+ * provider.
+ * @typedef {{
+ *   providerId: string,
+ *   profile: ?Object,
+ *   username: (?string|undefined),
+ *   isNewUser: boolean
+ * }}
+ */
+firebase.auth.AdditionalUserInfo;
+
+/**
+ * Interface representing ID token result obtained from
+ * {@link firebase.User#getIdTokenResult}. It contains the ID token JWT string
+ * and other helper properties for getting different data associated with the
+ * token as well as all the decoded payload claims.
+ *
+ * Note that these claims are not to be trusted as they are parsed client side.
+ * Only server side verification can guarantee the integrity of the token
+ * claims.
+ *
+ * @interface
+ */
+firebase.auth.IdTokenResult = function () {};
+
+/**
+ * The Firebase Auth ID token JWT string.
+ *
+ * @type {string}
+ */
+firebase.auth.IdTokenResult.prototype.token;
+
+/**
+ * The ID token expiration time formatted as a UTC string.
+ *
+ * @type {string}
+ */
+firebase.auth.IdTokenResult.prototype.expirationTime;
+
+/**
+ * The authentication time formatted as a UTC string. This is the time the
+ * user authenticated (signed in) and not the time the token was refreshed.
+ *
+ * @type {string}
+ */
+firebase.auth.IdTokenResult.prototype.authTime;
+
+/**
+ * The ID token issued at time formatted as a UTC string.
+ *
+ * @type {string}
+ */
+firebase.auth.IdTokenResult.prototype.issuedAtTime;
+
+/**
+ * The sign-in provider through which the ID token was obtained (anonymous,
+ * custom, phone, password, etc). Note, this does not map to provider IDs.
+ *
+ * @type {?string}
+ */
+firebase.auth.IdTokenResult.prototype.signInProvider;
+
+/**
+ * The type of second factor associated with this session, provided the user
+ * was multi-factor authenticated (eg. phone, etc).
+ *
+ * @type {?string}
+ */
+firebase.auth.IdTokenResult.prototype.signInSecondFactor;
+
+/**
+ * The entire payload claims of the ID token including the standard reserved
+ * claims as well as the custom claims.
+ *
+ * @type {!Object}
+ */
+firebase.auth.IdTokenResult.prototype.claims;
+
+/**
+ * Interface representing an Auth instance's settings, currently used for
+ * enabling/disabling app verification for phone Auth testing.
+ *
+ * @interface
+ */
+firebase.auth.AuthSettings = function () {};
+
+/**
+ * When set, this property disables app verification for the purpose of testing
+ * phone authentication. For this property to take effect, it needs to be set
+ * before rendering a reCAPTCHA app verifier. When this is disabled, a
+ * mock reCAPTCHA is rendered instead. This is useful for manual testing during
+ * development or for automated integration tests.
+ *
+ * In order to use this feature, you will need to
+ * {@link https://firebase.google.com/docs/auth/web/phone-auth#test-with-whitelisted-phone-numbers
+ * whitelist your phone number} via the
+ * Firebase Console.
+ *
+ * The default value is false (app verification is enabled).
+ *
+ * @type {boolean}
+ */
+firebase.auth.AuthSettings.prototype.appVerificationDisabledForTesting;
+
+/**
+ * Signs out the current user.
+ *
+ * @return {!firebase.Promise<void>}
+ */
+firebase.auth.Auth.prototype.signOut = function () {};
+
+/**
+ * An authentication error.
+ * For method-specific error codes, refer to the specific methods in the
+ * documentation. For common error codes, check the reference below. Use {@link
+ * firebase.auth.Error#code} to get the specific error code. For a detailed
+ * message, use {@link firebase.auth.Error#message}.
+ * Errors with the code <strong>auth/account-exists-with-different-credential
+ * </strong> will have the additional fields <strong>email</strong> and <strong>
+ * credential</strong> which are needed to provide a way to resolve these
+ * specific errors. Refer to {@link firebase.auth.Auth#signInWithPopup} for more
+ * information.
+ *
+ * <h4>Common Error Codes</h4>
+ * <dl>
+ * <dt>auth/app-deleted</dt>
+ * <dd>Thrown if the instance of FirebaseApp has been deleted.</dd>
+ * <dt>auth/app-not-authorized</dt>
+ * <dd>Thrown if the app identified by the domain where it's hosted, is not
+ *     authorized to use Firebase Authentication with the provided API key.
+ *     Review your key configuration in the Google API console.</dd>
+ * <dt>auth/argument-error</dt>
+ * <dd>Thrown if a method is called with incorrect arguments.</dd>
+ * <dt>auth/invalid-api-key</dt>
+ * <dd>Thrown if the provided API key is invalid. Please check that you have
+ *     copied it correctly from the Firebase Console.</dd>
+ * <dt>auth/invalid-user-token</dt>
+ * <dd>Thrown if the user's credential is no longer valid. The user must sign in
+ *     again.</dd>
+ * <dt>auth/network-request-failed</dt>
+ * <dd>Thrown if a network error (such as timeout, interrupted connection or
+ *     unreachable host) has occurred.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if you have not enabled the provider in the Firebase Console. Go
+ *     to the Firebase Console for your project, in the Auth section and the
+ *     <strong>Sign in Method</strong> tab and configure the provider.</dd>
+ * <dt>auth/requires-recent-login</dt>
+ * <dd>Thrown if the user's last sign-in time does not meet the security
+ *     threshold. Use {@link firebase.User#reauthenticateWithCredential} to
+ *     resolve. This does not apply if the user is anonymous.</dd>
+ * <dt>auth/too-many-requests</dt>
+ * <dd>Thrown if requests are blocked from a device due to unusual activity.
+ *     Trying again after some delay would unblock.</dd>
+ * <dt>auth/unauthorized-domain</dt>
+ * <dd>Thrown if the app domain is not authorized for OAuth operations for your
+ *     Firebase project. Edit the list of authorized domains from the Firebase
+ *     console.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user account has been disabled by an administrator.
+ *     Accounts can be enabled or disabled in the Firebase Console, the Auth
+ *     section and Users subsection.</dd>
+ * <dt>auth/user-token-expired</dt>
+ * <dd>Thrown if the user's credential has expired. This could also be thrown if
+ *     a user has been deleted. Prompting the user to sign in again should
+ *     resolve this for either case.</dd>
+ * <dt>auth/web-storage-unsupported</dt>
+ * <dd>Thrown if the browser does not support web storage or if the user
+ *     disables them.</dd>
+ * </dl>
+ *
+ * @interface
+ */
+firebase.auth.Error = function () {};
+
+/**
+ * Unique error code.
+ *
+ * @type {string}
+ */
+firebase.auth.Error.prototype.code;
+
+/**
+ * Complete error message.
+ *
+ * @type {string}
+ */
+firebase.auth.Error.prototype.message;
+
+/**
+ * The account conflict error.
+ * Refer to {@link firebase.auth.Auth.signInWithPopup} for more information.
+ *
+ * <h4>Common Error Codes</h4>
+ * <dl>
+ * <dt>auth/account-exists-with-different-credential</dt>
+ * <dd>Thrown if there already exists an account with the email address
+ *     asserted by the credential. Resolve this by calling
+ *     {@link firebase.auth.Auth.fetchSignInMethodsForEmail} with the
+ *     error.email and then asking the user to sign in using one of the returned
+ *     providers. Once the user is signed in, the original credential retrieved
+ *     from the error.credential can be linked to the user with
+ *     {@link firebase.User.linkWithCredential} to prevent the user from signing
+ *     in again to the original provider via popup or redirect. If you are using
+ *     redirects for sign in, save the credential in session storage and then
+ *     retrieve on redirect and repopulate the credential using for example
+ *     {@link firebase.auth.GoogleAuthProvider.credential} depending on the
+ *     credential provider id and complete the link.</dd>
+ * <dt>auth/credential-already-in-use</dt>
+ * <dd>Thrown if the account corresponding to the credential already exists
+ *     among your users, or is already linked to a Firebase User.
+ *     For example, this error could be thrown if you are upgrading an anonymous
+ *     user to a Google user by linking a Google credential to it and the Google
+ *     credential used is already associated with an existing Firebase Google
+ *     user.
+ *     The fields <code>error.email</code>, <code>error.phoneNumber</code>, and
+ *     <code>error.credential</code> ({@link firebase.auth.AuthCredential})
+ *     may be provided, depending on the type of credential. You can recover
+ *     from this error by signing in with <code>error.credential</code> directly
+ *     via {@link firebase.auth.Auth.signInWithCredential}.</dd>
+ * <dt>auth/email-already-in-use</dt>
+ * <dd>Thrown if the email corresponding to the credential already exists
+ *     among your users. When thrown while linking a credential to an existing
+ *     user, an <code>error.email</code> and <code>error.credential</code>
+ *     ({@link firebase.auth.AuthCredential}) fields are also provided.
+ *     You have to link the credential to the existing user with that email if
+ *     you wish to continue signing in with that credential. To do so, call
+ *     {@link firebase.auth.Auth.fetchSignInMethodsForEmail}, sign in to
+ *     <code>error.email</code> via one of the providers returned and then
+ *     {@link firebase.User.linkWithCredential} the original credential to that
+ *     newly signed in user.</dd>
+ * </dl>
+ *
+ * @interface
+ * @extends {firebase.auth.Error}
+ */
+firebase.auth.AuthError = function () {};
+
+/**
+ * The {@link firebase.auth.AuthCredential} that can be used to resolve the
+ * error.
+ *
+ * @type {!firebase.auth.AuthCredential|undefined}
+ */
+firebase.auth.AuthError.prototype.credential;
+
+/**
+ * The email of the user's account used for sign-in/linking.
+ *
+ * @type {string|undefined}
+ */
+firebase.auth.AuthError.prototype.email;
+
+/**
+ * The phone number of the user's account used for sign-in/linking.
+ *
+ * @type {string|undefined}
+ */
+firebase.auth.AuthError.prototype.phoneNumber;
+
+/**
+ * The tenant ID being used for sign-in/linking. If you use
+ * {@link firebase.auth.signInWithRedirect} to sign in, you have to
+ * set the tenant ID on Auth instanace again as the tenant ID is not
+ * persisted after redirection.
+ *
+ * @type {string|undefined}
+ */
+firebase.auth.AuthError.prototype.tenantId;
+
+/**
+ * The error thrown when the user needs to provide a second factor to sign in
+ * successfully.
+ * The error code for this error is <code>auth/multi-factor-auth-required</code>.
+ * This error provides a {@link firebase.auth.MultiFactorResolver} object,
+ * which you can use to get the second sign-in factor from the user.
+ *
+ * @example
+ * ```javascript
+ * firebase.auth().signInWithEmailAndPassword()
+ *     .then(function(result) {
+ *       // User signed in. No 2nd factor challenge is needed.
+ *     })
+ *     .catch(function(error) {
+ *       if (error.code == 'auth/multi-factor-auth-required') {
+ *         var resolver = error.resolver;
+ *         var multiFactorHints = resolver.hints;
+ *       } else {
+ *         // Handle other errors.
+ *       }
+ *     });
+ *
+ * resolver.resolveSignIn(multiFactorAssertion)
+ *     .then(function(userCredential) {
+ *       // User signed in.
+ *     });
+ * ```
+ *
+ * @interface
+ * @extends {firebase.auth.Error}
+ */
+firebase.auth.MultiFactorError = function () {};
+
+/**
+ * The multi-factor resolver to complete second factor sign-in.
+ *
+ * @type {!firebase.auth.MultiFactorResolver}
+ */
+firebase.auth.MultiFactorError.prototype.resolver;
+
+//
+// List of Auth Providers.
+//
+
+/**
+ * Interface that represents an auth provider.
+ *
+ * @interface
+ */
+firebase.auth.AuthProvider = function () {};
+
+/** @type {string} */
+firebase.auth.AuthProvider.prototype.providerId;
+
+/**
+ * Generic OAuth provider.
+ *
+ * @example
+ * // Using a redirect.
+ * firebase.auth().getRedirectResult().then(function(result) {
+ *   if (result.credential) {
+ *     // This gives you the OAuth Access Token for that provider.
+ *     var token = result.credential.accessToken;
+ *   }
+ *   var user = result.user;
+ * });
+ *
+ * // Start a sign in process for an unauthenticated user.
+ * var provider = new firebase.auth.OAuthProvider('google.com');
+ * provider.addScope('profile');
+ * provider.addScope('email');
+ * firebase.auth().signInWithRedirect(provider);
+ *
+ * @example
+ * // Using a popup.
+ * var provider = new firebase.auth.OAuthProvider('google.com');
+ * provider.addScope('profile');
+ * provider.addScope('email');
+ * firebase.auth().signInWithPopup(provider).then(function(result) {
+ *  // This gives you the OAuth Access Token for that provider.
+ *  var token = result.credential.accessToken;
+ *  // The signed-in user info.
+ *  var user = result.user;
+ * });
+ *
+ * @see {@link firebase.auth.Auth#onAuthStateChanged} to receive sign in state
+ * changes.
+ * @param {string} providerId The associated provider ID, such as `github.com`.
+ * @constructor
+ * @implements {firebase.auth.AuthProvider}
+ */
+firebase.auth.OAuthProvider = function (providerId) {};
+
+/**
+ * Creates a Firebase credential from a generic OAuth provider's access token or
+ * ID token. The raw nonce is required when an ID token with a nonce field is
+ * provided. The SHA-256 hash of the raw nonce must match the nonce field in
+ * the ID token.
+ *
+ * @example
+ * // `googleUser` from the onsuccess Google Sign In callback.
+ * // Initialize a generate OAuth provider with a `google.com` providerId.
+ * var provider = new firebase.auth.OAuthProvider('google.com');
+ * var credential = provider.credential({
+ *   idToken: googleUser.getAuthResponse().id_token,
+ * });
+ * firebase.auth().signInWithCredential(credential)
+ *
+ * @param {?firebase.auth.OAuthCredentialOptions|string} optionsOrIdToken Either
+ *     the options object containing the ID token, access token and raw nonce or
+ *     the ID token string.
+ * @param {?string=} accessToken The OAuth access token.
+ * @return {!firebase.auth.OAuthCredential} The auth provider credential.
+ */
+firebase.auth.OAuthProvider.prototype.credential = function (
+  optionsOrIdToken,
+  accessToken
+) {};
+
+/** @type {string} */
+firebase.auth.OAuthProvider.prototype.providerId;
+
+/**
+ * @param {string} scope Provider OAuth scope to add.
+ * @return {!firebase.auth.OAuthProvider} The provider instance.
+ */
+firebase.auth.OAuthProvider.prototype.addScope = function (scope) {};
+
+/**
+ * Sets the OAuth custom parameters to pass in an OAuth request for popup
+ * and redirect sign-in operations.
+ * For a detailed list, check the
+ * reserved required OAuth 2.0 parameters such as `client_id`, `redirect_uri`,
+ * `scope`, `response_type` and `state` are not allowed and will be ignored.
+ * @param {!Object} customOAuthParameters The custom OAuth parameters to pass
+ *     in the OAuth request.
+ * @return {!firebase.auth.OAuthProvider} The provider instance.
+ */
+firebase.auth.OAuthProvider.prototype.setCustomParameters = function (
+  customOAuthParameters
+) {};
+
+/**
+ * Facebook auth provider.
+ *
+ * @example
+ * // Sign in using a redirect.
+ * firebase.auth().getRedirectResult().then(function(result) {
+ *   if (result.credential) {
+ *     // This gives you a Google Access Token.
+ *     var token = result.credential.accessToken;
+ *   }
+ *   var user = result.user;
+ * })
+ * // Start a sign in process for an unauthenticated user.
+ * var provider = new firebase.auth.FacebookAuthProvider();
+ * provider.addScope('user_birthday');
+ * firebase.auth().signInWithRedirect(provider);
+ *
+ * @example
+ * // Sign in using a popup.
+ * var provider = new firebase.auth.FacebookAuthProvider();
+ * provider.addScope('user_birthday');
+ * firebase.auth().signInWithPopup(provider).then(function(result) {
+ *   // This gives you a Facebook Access Token.
+ *   var token = result.credential.accessToken;
+ *   // The signed-in user info.
+ *   var user = result.user;
+ * });
+ *
+ * @see {@link firebase.auth.Auth#onAuthStateChanged} to receive sign in state
+ * changes.
+ * @constructor
+ * @implements {firebase.auth.AuthProvider}
+ */
+firebase.auth.FacebookAuthProvider = function () {};
+
+/** @type {string} */
+firebase.auth.FacebookAuthProvider.PROVIDER_ID;
+
+/**
+ * This corresponds to the sign-in method identifier as returned in
+ * {@link firebase.auth.Auth#fetchSignInMethodsForEmail}.
+ *
+ * @type {string}
+ */
+firebase.auth.FacebookAuthProvider.FACEBOOK_SIGN_IN_METHOD;
+
+/**
+ * @example
+ * var cred = firebase.auth.FacebookAuthProvider.credential(
+ *     // `event` from the Facebook auth.authResponseChange callback.
+ *     event.authResponse.accessToken
+ * );
+ *
+ * @param {string} token Facebook access token.
+ * @return {!firebase.auth.OAuthCredential} The auth provider credential.
+ */
+firebase.auth.FacebookAuthProvider.credential = function (token) {};
+
+/** @type {string} */
+firebase.auth.FacebookAuthProvider.prototype.providerId;
+
+/**
+ * @param {string} scope Facebook OAuth scope.
+ * @return {!firebase.auth.AuthProvider} The provider instance itself.
+ */
+firebase.auth.FacebookAuthProvider.prototype.addScope = function (scope) {};
+
+/**
+ * Sets the OAuth custom parameters to pass in a Facebook OAuth request for
+ * popup and redirect sign-in operations.
+ * Valid parameters include 'auth_type', 'display' and 'locale'.
+ * For a detailed list, check the
+ * {@link https://goo.gl/pve4fo Facebook}
+ * documentation.
+ * Reserved required OAuth 2.0 parameters such as 'client_id', 'redirect_uri',
+ * 'scope', 'response_type' and 'state' are not allowed and will be ignored.
+ * @param {!Object} customOAuthParameters The custom OAuth parameters to pass
+ *     in the OAuth request.
+ * @return {!firebase.auth.AuthProvider} The provider instance itself.
+ */
+firebase.auth.FacebookAuthProvider.prototype.setCustomParameters = function (
+  customOAuthParameters
+) {};
+
+/**
+ * Github auth provider.
+ *
+ * GitHub requires an OAuth 2.0 redirect, so you can either handle the redirect
+ * directly, or use the signInWithPopup handler:
+ *
+ * @example
+ * // Using a redirect.
+ * firebase.auth().getRedirectResult().then(function(result) {
+ *   if (result.credential) {
+ *     // This gives you a GitHub Access Token.
+ *     var token = result.credential.accessToken;
+ *   }
+ *   var user = result.user;
+ * }).catch(function(error) {
+ *   // Handle Errors here.
+ *   var errorCode = error.code;
+ *   var errorMessage = error.message;
+ *   // The email of the user's account used.
+ *   var email = error.email;
+ *   // The firebase.auth.AuthCredential type that was used.
+ *   var credential = error.credential;
+ *   if (errorCode === 'auth/account-exists-with-different-credential') {
+ *     alert('You have signed up with a different provider for that email.');
+ *     // Handle linking here if your app allows it.
+ *   } else {
+ *     console.error(error);
+ *   }
+ * });
+ *
+ * // Start a sign in process for an unauthenticated user.
+ * var provider = new firebase.auth.GithubAuthProvider();
+ * provider.addScope('repo');
+ * firebase.auth().signInWithRedirect(provider);
+ *
+ * @example
+ * // With popup.
+ * var provider = new firebase.auth.GithubAuthProvider();
+ *  provider.addScope('repo');
+ *  firebase.auth().signInWithPopup(provider).then(function(result) {
+ *    // This gives you a GitHub Access Token.
+ *    var token = result.credential.accessToken;
+ *    // The signed-in user info.
+ *    var user = result.user;
+ *  }).catch(function(error) {
+ *    // Handle Errors here.
+ *    var errorCode = error.code;
+ *    var errorMessage = error.message;
+ *    // The email of the user's account used.
+ *    var email = error.email;
+ *    // The firebase.auth.AuthCredential type that was used.
+ *    var credential = error.credential;
+ *    if (errorCode === 'auth/account-exists-with-different-credential') {
+ *      alert('You have signed up with a different provider for that email.');
+ *      // Handle linking here if your app allows it.
+ *    } else {
+ *      console.error(error);
+ *    }
+ *  });
+ *
+ * @see {@link firebase.auth.Auth#onAuthStateChanged} to receive sign in state
+ * changes.
+ * @constructor
+ * @implements {firebase.auth.AuthProvider}
+ */
+firebase.auth.GithubAuthProvider = function () {};
+
+/** @type {string} */
+firebase.auth.GithubAuthProvider.PROVIDER_ID;
+
+/**
+ * This corresponds to the sign-in method identifier as returned in
+ * {@link firebase.auth.Auth#fetchSignInMethodsForEmail}.
+ *
+ * @type {string}
+ */
+firebase.auth.GithubAuthProvider.GITHUB_SIGN_IN_METHOD;
+
+/**
+ * @example
+ * var cred = firebase.auth.FacebookAuthProvider.credential(
+ *     // `event` from the Facebook auth.authResponseChange callback.
+ *     event.authResponse.accessToken
+ * );
+ *
+ * @param {string} token Github access token.
+ * @return {!firebase.auth.OAuthCredential} The auth provider credential.
+ */
+firebase.auth.GithubAuthProvider.credential = function (token) {};
+
+/** @type {string} */
+firebase.auth.GithubAuthProvider.prototype.providerId;
+
+/**
+ * @param {string} scope Github OAuth scope.
+ * @return {!firebase.auth.AuthProvider} The provider instance itself.
+ */
+firebase.auth.GithubAuthProvider.prototype.addScope = function (scope) {};
+
+/**
+ * Sets the OAuth custom parameters to pass in a GitHub OAuth request for popup
+ * and redirect sign-in operations.
+ * Valid parameters include 'allow_signup'.
+ * For a detailed list, check the
+ * {@link https://developer.github.com/v3/oauth/ GitHub} documentation.
+ * Reserved required OAuth 2.0 parameters such as 'client_id', 'redirect_uri',
+ * 'scope', 'response_type' and 'state' are not allowed and will be ignored.
+ * @param {!Object} customOAuthParameters The custom OAuth parameters to pass
+ *     in the OAuth request.
+ * @return {!firebase.auth.AuthProvider} The provider instance itself.
+ */
+firebase.auth.GithubAuthProvider.prototype.setCustomParameters = function (
+  customOAuthParameters
+) {};
+
+/**
+ * Google auth provider.
+ *
+ * @example
+ * // Using a redirect.
+ * firebase.auth().getRedirectResult().then(function(result) {
+ *   if (result.credential) {
+ *     // This gives you a Google Access Token.
+ *     var token = result.credential.accessToken;
+ *   }
+ *   var user = result.user;
+ * });
+ *
+ * // Start a sign in process for an unauthenticated user.
+ * var provider = new firebase.auth.GoogleAuthProvider();
+ * provider.addScope('profile');
+ * provider.addScope('email');
+ * firebase.auth().signInWithRedirect(provider);
+ *
+ * @example
+ * // Using a popup.
+ * var provider = new firebase.auth.GoogleAuthProvider();
+ * provider.addScope('profile');
+ * provider.addScope('email');
+ * firebase.auth().signInWithPopup(provider).then(function(result) {
+ *  // This gives you a Google Access Token.
+ *  var token = result.credential.accessToken;
+ *  // The signed-in user info.
+ *  var user = result.user;
+ * });
+ *
+ * @see {@link firebase.auth.Auth#onAuthStateChanged} to receive sign in state
+ * changes.
+ * @constructor
+ * @implements {firebase.auth.AuthProvider}
+ */
+firebase.auth.GoogleAuthProvider = function () {};
+
+/** @type {string} */
+firebase.auth.GoogleAuthProvider.PROVIDER_ID;
+
+/**
+ * This corresponds to the sign-in method identifier as returned in
+ * {@link firebase.auth.Auth#fetchSignInMethodsForEmail}.
+ *
+ * @type {string}
+ */
+firebase.auth.GoogleAuthProvider.GOOGLE_SIGN_IN_METHOD;
+
+/**
+ * Creates a credential for Google. At least one of ID token and access token
+ * is required.
+ *
+ * @example
+ * // `googleUser` from the onsuccess Google Sign In callback.
+ * var credential = firebase.auth.GoogleAuthProvider.credential(
+              googleUser.getAuthResponse().id_token);
+ * firebase.auth().signInWithCredential(credential)
+ *
+ * @param {?string=} idToken Google ID token.
+ * @param {?string=} accessToken Google access token.
+ * @return {!firebase.auth.OAuthCredential} The auth provider credential.
+ */
+firebase.auth.GoogleAuthProvider.credential = function (
+  idToken,
+  accessToken
+) {};
+
+/** @type {string} */
+firebase.auth.GoogleAuthProvider.prototype.providerId;
+
+/**
+ * @param {string} scope Google OAuth scope.
+ * @return {!firebase.auth.AuthProvider} The provider instance itself.
+ */
+firebase.auth.GoogleAuthProvider.prototype.addScope = function (scope) {};
+
+/**
+ * Sets the OAuth custom parameters to pass in a Google OAuth request for popup
+ * and redirect sign-in operations.
+ * Valid parameters include 'hd', 'hl', 'include_granted_scopes', 'login_hint'
+ * and 'prompt'.
+ * For a detailed list, check the
+ * {@link https://goo.gl/Xo01Jm Google}
+ * documentation.
+ * Reserved required OAuth 2.0 parameters such as 'client_id', 'redirect_uri',
+ * 'scope', 'response_type' and 'state' are not allowed and will be ignored.
+ * @param {!Object} customOAuthParameters The custom OAuth parameters to pass
+ *     in the OAuth request.
+ * @return {!firebase.auth.AuthProvider} The provider instance itself.
+ */
+firebase.auth.GoogleAuthProvider.prototype.setCustomParameters = function (
+  customOAuthParameters
+) {};
+
+/**
+ * Twitter auth provider.
+ *
+ * @example
+ * // Using a redirect.
+ * firebase.auth().getRedirectResult().then(function(result) {
+ *   if (result.credential) {
+ *     // For accessing the Twitter API.
+ *     var token = result.credential.accessToken;
+ *     var secret = result.credential.secret;
+ *   }
+ *   var user = result.user;
+ * });
+ *
+ * // Start a sign in process for an unauthenticated user.
+ * var provider = new firebase.auth.TwitterAuthProvider();
+ * firebase.auth().signInWithRedirect(provider);
+ *
+ * @example
+ * // Using a popup.
+ * var provider = new firebase.auth.TwitterAuthProvider();
+ * firebase.auth().signInWithPopup(provider).then(function(result) {
+ *   // For accessing the Twitter API.
+ *   var token = result.credential.accessToken;
+ *   var secret = result.credential.secret;
+ *   // The signed-in user info.
+ *   var user = result.user;
+ * });
+ *
+ * @see {@link firebase.auth.Auth#onAuthStateChanged} to receive sign in state
+ * changes.
+ * @constructor
+ * @implements {firebase.auth.AuthProvider}
+ */
+firebase.auth.TwitterAuthProvider = function () {};
+
+/** @type {string} */
+firebase.auth.TwitterAuthProvider.PROVIDER_ID;
+
+/**
+ * This corresponds to the sign-in method identifier as returned in
+ * {@link firebase.auth.Auth#fetchSignInMethodsForEmail}.
+ *
+ * @type {string}
+ */
+firebase.auth.TwitterAuthProvider.TWITTER_SIGN_IN_METHOD;
+
+/**
+ * @param {string} token Twitter access token.
+ * @param {string} secret Twitter secret.
+ * @return {!firebase.auth.OAuthCredential} The auth provider credential.
+ */
+firebase.auth.TwitterAuthProvider.credential = function (token, secret) {};
+
+/** @type {string} */
+firebase.auth.TwitterAuthProvider.prototype.providerId;
+
+/**
+ * Sets the OAuth custom parameters to pass in a Twitter OAuth request for popup
+ * and redirect sign-in operations.
+ * Valid parameters include 'lang'.
+ * Reserved required OAuth 1.0 parameters such as 'oauth_consumer_key',
+ * 'oauth_token', 'oauth_signature', etc are not allowed and will be ignored.
+ * @param {!Object} customOAuthParameters The custom OAuth parameters to pass
+ *     in the OAuth request.
+ * @return {!firebase.auth.AuthProvider} The provider instance itself.
+ */
+firebase.auth.TwitterAuthProvider.prototype.setCustomParameters = function (
+  customOAuthParameters
+) {};
+
+/**
+ * Email and password auth provider implementation.
+ *
+ * To authenticate: {@link firebase.auth.Auth#createUserWithEmailAndPassword}
+ * and {@link firebase.auth.Auth#signInWithEmailAndPassword}.
+ *
+ * @constructor
+ * @implements {firebase.auth.AuthProvider}
+ */
+firebase.auth.EmailAuthProvider = function () {};
+
+/** @type {string} */
+firebase.auth.EmailAuthProvider.PROVIDER_ID;
+
+/**
+ * This corresponds to the sign-in method identifier as returned in
+ * {@link firebase.auth.Auth#fetchSignInMethodsForEmail}.
+ *
+ * @type {string}
+ */
+firebase.auth.EmailAuthProvider.EMAIL_PASSWORD_SIGN_IN_METHOD;
+
+/**
+ * This corresponds to the sign-in method identifier as returned in
+ * {@link firebase.auth.Auth#fetchSignInMethodsForEmail}.
+ *
+ * @type {string}
+ */
+firebase.auth.EmailAuthProvider.EMAIL_LINK_SIGN_IN_METHOD;
+
+/**
+ * @example
+ * var cred = firebase.auth.EmailAuthProvider.credential(
+ *     email,
+ *     password
+ * );
+ *
+ * @param {string} email Email address.
+ * @param {string} password User account password.
+ * @return {!firebase.auth.AuthCredential} The auth provider credential.
+ */
+firebase.auth.EmailAuthProvider.credential = function (email, password) {};
+
+/**
+ * Initialize an `EmailAuthProvider` credential using an email and an email link
+ * after a sign in with email link operation.
+ *
+ * @example
+ * var cred = firebase.auth.EmailAuthProvider.credentialWithLink(
+ *     email,
+ *     emailLink
+ * );
+ *
+ * @param {string} email Email address.
+ * @param {string} emailLink Sign-in email link.
+ * @return {!firebase.auth.AuthCredential} The auth provider credential.
+ */
+firebase.auth.EmailAuthProvider.credentialWithLink = function (
+  email,
+  emailLink
+) {};
+
+/** @type {string} */
+firebase.auth.EmailAuthProvider.prototype.providerId;
+
+/**
+ * Phone number auth provider.
+ *
+ * @example
+ * // 'recaptcha-container' is the ID of an element in the DOM.
+ * var applicationVerifier = new firebase.auth.RecaptchaVerifier(
+ *     'recaptcha-container');
+ * var provider = new firebase.auth.PhoneAuthProvider();
+ * provider.verifyPhoneNumber('+16505550101', applicationVerifier)
+ *     .then(function(verificationId) {
+ *       var verificationCode = window.prompt('Please enter the verification ' +
+ *           'code that was sent to your mobile device.');
+ *       return firebase.auth.PhoneAuthProvider.credential(verificationId,
+ *           verificationCode);
+ *     })
+ *     .then(function(phoneCredential) {
+ *       return firebase.auth().signInWithCredential(phoneCredential);
+ *     });
+ *
+ * @constructor
+ * @param {?firebase.auth.Auth=} auth The Firebase Auth instance in which
+ *     sign-ins should occur. Uses the default Auth instance if unspecified.
+ * @implements {firebase.auth.AuthProvider}
+ */
+firebase.auth.PhoneAuthProvider = function (auth) {};
+
+/** @type {string} */
+firebase.auth.PhoneAuthProvider.PROVIDER_ID;
+
+/**
+ * This corresponds to the sign-in method identifier as returned in
+ * {@link firebase.auth.Auth#fetchSignInMethodsForEmail}.
+ *
+ * @type {string}
+ */
+firebase.auth.PhoneAuthProvider.PHONE_SIGN_IN_METHOD;
+
+/**
+ * Creates a phone auth credential, given the verification ID from
+ * {@link firebase.auth.PhoneAuthProvider#verifyPhoneNumber} and the code
+ * that was sent to the user's mobile device.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/missing-verification-code</dt>
+ * <dd>Thrown if the verification code is missing.</dd>
+ * <dt>auth/missing-verification-id</dt>
+ * <dd>Thrown if the verification ID is missing.</dd>
+ * </dl>
+ *
+ * @param {string} verificationId The verification ID returned from
+ *     {@link firebase.auth.PhoneAuthProvider#verifyPhoneNumber}.
+ * @param {string} verificationCode The verification code sent to the user's
+ *     mobile device.
+ * @return {!firebase.auth.PhoneAuthCredential} The auth provider credential.
+ */
+firebase.auth.PhoneAuthProvider.credential = function (
+  verificationId,
+  verificationCode
+) {};
+
+/** @type {string} */
+firebase.auth.PhoneAuthProvider.prototype.providerId;
+
+/**
+ * Starts a phone number authentication flow by sending a verification code to
+ * the given phone number. Returns an ID that can be passed to
+ * {@link firebase.auth.PhoneAuthProvider#credential} to identify this flow.
+ *
+ * For abuse prevention, this method also requires a
+ * {@link firebase.auth.ApplicationVerifier}. The Firebase Auth SDK includes
+ * a reCAPTCHA-based implementation, {@link firebase.auth.RecaptchaVerifier}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/captcha-check-failed</dt>
+ * <dd>Thrown if the reCAPTCHA response token was invalid, expired, or if
+ *     this method was called from a non-whitelisted domain.</dd>
+ * <dt>auth/invalid-phone-number</dt>
+ * <dd>Thrown if the phone number has an invalid format.</dd>
+ * <dt>auth/missing-phone-number</dt>
+ * <dd>Thrown if the phone number is missing.</dd>
+ * <dt>auth/quota-exceeded</dt>
+ * <dd>Thrown if the SMS quota for the Firebase project has been exceeded.</dd>
+ * <dt>auth/user-disabled</dt>
+ * <dd>Thrown if the user corresponding to the given phone number has been
+ *     disabled.</dd>
+ * <dt>auth/maximum-second-factor-count-exceeded</dt>
+ * <dd>Thrown if The maximum allowed number of second factors on a user
+ *     has been exceeded.</dd>
+ * <dt>auth/second-factor-already-in-use</dt>
+ * <dd>Thrown if the second factor is already enrolled on this account.</dd>
+ * <dt>auth/unsupported-first-factor</dt>
+ * <dd>Thrown if the first factor being used to sign in is not supported.</dd>
+ * <dt>auth/unverified-email</dt>
+ * <dd>Thrown if the email of the account is not verified.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.PhoneInfoOptions|string} phoneInfoOptions The user's
+ *     {@link firebase.auth.PhoneInfoOptions}. The phone number should be in
+ *     E.164 format (e.g. +16505550101).
+ * @param {!firebase.auth.ApplicationVerifier} applicationVerifier
+ * @return {!firebase.Promise<string>} A Promise for the verification ID.
+ */
+firebase.auth.PhoneAuthProvider.prototype.verifyPhoneNumber = function (
+  phoneInfoOptions,
+  applicationVerifier
+) {};
+
+/**
+ * A verifier for domain verification and abuse prevention. Currently, the
+ * only implementation is {@link firebase.auth.RecaptchaVerifier}.
+ * @interface
+ */
+firebase.auth.ApplicationVerifier = function () {};
+
+/**
+ * Identifies the type of application verifier (e.g. "recaptcha").
+ * @type {string}
+ */
+firebase.auth.ApplicationVerifier.prototype.type;
+
+/**
+ * Executes the verification process.
+ * @return {!firebase.Promise<string>} A Promise for a token that can be used to
+ *     assert the validity of a request.
+ */
+firebase.auth.ApplicationVerifier.prototype.verify = function () {};
+
+/**
+ * The interface for asserting ownership of a second factor. This is used to
+ * facilitate enrollment of a second factor on an existing user
+ * or sign-in of a user who already verified the first factor.
+ *
+ * @interface
+ */
+firebase.auth.MultiFactorAssertion = function () {};
+
+/**
+ * The identifier of the second factor.
+ * @type {string}
+ */
+firebase.auth.MultiFactorAssertion.prototype.factorId;
+
+/**
+ * The interface for asserting ownership of a phone second factor.
+ *
+ * @interface
+ * @extends {firebase.auth.MultiFactorAssertion}
+ */
+firebase.auth.PhoneMultiFactorAssertion = function () {};
+
+/**
+ * The interface used to initialize a
+ * {@link firebase.auth.PhoneMultiFactorAssertion}.
+ *
+ * @interface
+ */
+firebase.auth.PhoneMultiFactorGenerator = function () {};
+
+/**
+ * The identifier of the phone second factor: `phone`.
+ * @type {string}
+ */
+firebase.auth.PhoneMultiFactorGenerator.FACTOR_ID;
+
+/**
+ * Initializes the {@link firebase.auth.PhoneMultiFactorAssertion} to confirm
+ * ownership of the phone second factor.
+ *
+ * @param {!firebase.auth.PhoneAuthCredential} phoneAuthCredential The phone
+ *     Auth credential.
+ * @return {!firebase.auth.PhoneMultiFactorAssertion}
+ */
+firebase.auth.PhoneMultiFactorGenerator.assertion = function (
+  phoneAuthCredential
+) {};
+
+/**
+ * A structure containing the information of a second factor entity.
+ *
+ * @interface
+ */
+firebase.auth.MultiFactorInfo = function () {};
+
+/**
+ * The multi-factor enrollment ID.
+ * @type {string}
+ */
+firebase.auth.MultiFactorInfo.prototype.uid;
+
+/**
+ * The user friendly name of the current second factor.
+ * @type {?string|undefined}
+ */
+firebase.auth.MultiFactorInfo.prototype.displayName;
+
+/**
+ * The enrollment date of the second factor formatted as a UTC string.
+ * @type {string}
+ */
+firebase.auth.MultiFactorInfo.prototype.enrollmentTime;
+
+/**
+ * The identifier of the second factor.
+ * @type {string}
+ */
+firebase.auth.MultiFactorInfo.prototype.factorId;
+
+/**
+ * The subclass of the `MultiFactorInfo` interface for phone number second
+ * factors. The factorId of this second factor is
+ * {@link firebase.auth.PhoneMultiFactorGenerator.FACTOR_ID}.
+ *
+ * @interface
+ * @extends {firebase.auth.MultiFactorInfo}
+ */
+firebase.auth.PhoneMultiFactorInfo = function () {};
+
+/**
+ * The phone number associated with the current second factor.
+ * @type {string}
+ */
+firebase.auth.PhoneMultiFactorInfo.prototype.phoneNumber;
+
+/**
+ * The phone info options for single-factor sign-in. Only phone number is
+ * required.
+ *
+ * @typedef {{
+ *   phoneNumber: string
+ * }}
+ */
+firebase.auth.PhoneSingleFactorInfoOptions;
+
+/**
+ * The phone info options for multi-factor enrollment. Phone number and
+ * multi-factor session are required.
+ *
+ * @typedef {{
+ *   phoneNumber: string,
+ *   session: !firebase.auth.MultiFactorSession
+ * }}
+ */
+firebase.auth.PhoneMultiFactorEnrollInfoOptions;
+
+/**
+ * The phone info options for multi-factor sign-in. Either multi-factor hint or
+ * multi-factor UID and multi-factor session are required.
+ *
+ * @typedef {{
+ *   multiFactorHint: !firebase.auth.MultiFactorInfo,
+ *   session: !firebase.auth.MultiFactorSession
+ * }|{
+ *   multiFactorUid: string,
+ *   session: !firebase.auth.MultiFactorSession
+ * }}
+ */
+firebase.auth.PhoneMultiFactorSignInInfoOptions;
+
+/**
+ * The information required to verify the ownership of a phone number. The
+ * information that's required depends on whether you are doing single-factor
+ * sign-in, multi-factor enrollment or multi-factor sign-in.
+ *
+ * @typedef {
+ *   !firebase.auth.PhoneSingleFactorInfoOptions|
+ *   !firebase.auth.PhoneMultiFactorEnrollInfoOptions|
+ *   !firebase.auth.PhoneMultiFactorSignInInfoOptions
+ * }
+ */
+firebase.auth.PhoneInfoOptions;
+
+/**
+ * The interface used to facilitate recovery from
+ * {@link firebase.auth.MultiFactorError} when a user needs to provide a second
+ * factor to sign in.
+ *
+ * @example
+ * ```javascript
+ * firebase.auth().signInWithEmailAndPassword()
+ *     .then(function(result) {
+ *       // User signed in. No 2nd factor challenge is needed.
+ *     })
+ *     .catch(function(error) {
+ *       if (error.code == 'auth/multi-factor-auth-required') {
+ *         var resolver = error.resolver;
+ *         // Show UI to let user select second factor.
+ *         var multiFactorHints = resolver.hints;
+ *       } else {
+ *         // Handle other errors.
+ *       }
+ *     });
+ *
+ * // The enrolled second factors that can be used to complete
+ * // sign-in are returned in the `MultiFactorResolver.hints` list.
+ * // UI needs to be presented to allow the user to select a second factor
+ * // from that list.
+ *
+ * var selectedHint = // ; selected from multiFactorHints
+ * var phoneAuthProvider = new firebase.auth.PhoneAuthProvider();
+ * var phoneInfoOptions = {
+ *   multiFactorHint: selectedHint,
+ *   session: resolver.session
+ * };
+ * phoneAuthProvider.verifyPhoneNumber(
+ *   phoneInfoOptions,
+ *   appVerifier
+ * ).then(function(verificationId) {
+ *   // store verificationID and show UI to let user enter verification code.
+ * });
+ *
+ * // UI to enter verification code and continue.
+ * // Continue button click handler
+ * var phoneAuthCredential =
+ *     firebase.auth.PhoneAuthProvider.credential(
+ *         verificationId, verificationCode);
+ * var multiFactorAssertion =
+ *     firebase.auth.PhoneMultiFactorGenerator.assertion(phoneAuthCredential);
+ * resolver.resolveSignIn(multiFactorAssertion)
+ *     .then(function(userCredential) {
+ *       // User signed in.
+ *     });
+ * ```
+ * @interface
+ */
+firebase.auth.MultiFactorResolver = function () {};
+
+/**
+ * The Auth instance used to sign in with the first factor.
+ * @type {!firebase.auth.Auth}
+ */
+firebase.auth.MultiFactorResolver.prototype.auth;
+
+/**
+ * The session identifier for the current sign-in flow, which can be used
+ * to complete the second factor sign-in.
+ * @type {!firebase.auth.MultiFactorSession}
+ */
+firebase.auth.MultiFactorResolver.prototype.session;
+
+/**
+ * The list of hints for the second factors needed to complete the sign-in
+ * for the current session.
+ * @type {!Array<!firebase.auth.MultiFactorInfo>}
+ */
+firebase.auth.MultiFactorResolver.prototype.hints;
+
+/**
+ * A helper function to help users complete sign in with a second factor
+ * using an {@link firebase.auth.MultiFactorAssertion} confirming the user
+ * successfully completed the second factor challenge.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the verification code is not valid.</dd>
+ * <dt>auth/missing-verification-code</dt>
+ * <dd>Thrown if the verification code is missing.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider.credential} and the verification
+ *     ID of the credential is not valid.</dd>
+ * <dt>auth/missing-verification-id</dt>
+ * <dd>Thrown if the verification ID is missing.</dd>
+ * <dt>auth/code-expired</dt>
+ * <dd>Thrown if the verification code has expired.</dd>
+ * <dt>auth/invalid-multi-factor-session</dt>
+ * <dd>Thrown if the request does not contain a valid proof of first factor
+ *     successful sign-in.</dd>
+ * <dt>auth/missing-multi-factor-session</dt>
+ * <dd>Thrown if The request is missing proof of first factor successful
+ *     sign-in.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.MultiFactorAssertion} assertion The multi-factor
+ *     assertion to resolve sign-in with.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>} The promise that
+ *     resolves with the user credential object.
+ */
+firebase.auth.MultiFactorResolver.prototype.resolveSignIn = function (
+  assertion
+) {};
+
+/**
+ * The multi-factor session object used for enrolling a second factor on a
+ * user or helping sign in an enrolled user with a second factor.
+ *
+ * @interface
+ */
+firebase.auth.MultiFactorSession = function () {};
+
+/**
+ * This is the interface that defines the multi-factor related properties and
+ * operations pertaining to a {@link firebase.User}.
+ *
+ * @interface
+ */
+firebase.User.MultiFactorUser = function () {};
+
+/**
+ * Returns a list of the user's enrolled second factors.
+ * @type {!Array<!firebase.auth.MultiFactorInfo>}
+ */
+firebase.User.MultiFactorUser.prototype.enrolledFactors;
+
+/**
+ * Enrolls a second factor as identified by the
+ * {@link firebase.auth.MultiFactorAssertion} for the current user.
+ * On resolution, the user tokens are updated to reflect the change in the
+ * JWT payload.
+ * Accepts an additional display name parameter used to identify the second
+ * factor to the end user.
+ * Recent re-authentication is required for this operation to succeed.
+ * On successful enrollment, existing Firebase sessions (refresh tokens) are
+ * revoked. When a new factor is enrolled, an email notification is sent
+ * to the user’s email.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/invalid-verification-code</dt>
+ * <dd>Thrown if the verification code is not valid.</dd>
+ * <dt>auth/missing-verification-code</dt>
+ * <dd>Thrown if the verification code is missing.</dd>
+ * <dt>auth/invalid-verification-id</dt>
+ * <dd>Thrown if the credential is a
+ *     {@link firebase.auth.PhoneAuthProvider.credential} and the verification
+ *     ID of the credential is not valid.</dd>
+ * <dt>auth/missing-verification-id</dt>
+ * <dd>Thrown if the verification ID is missing.</dd>
+ * <dt>auth/code-expired</dt>
+ * <dd>Thrown if the verification code has expired.</dd>
+ * <dt>auth/maximum-second-factor-count-exceeded</dt>
+ * <dd>Thrown if The maximum allowed number of second factors on a user
+ *     has been exceeded.</dd>
+ * <dt>auth/second-factor-already-in-use</dt>
+ * <dd>Thrown if the second factor is already enrolled on this account.</dd>
+ * <dt>auth/unsupported-first-factor</dt>
+ * <dd>Thrown if the first factor being used to sign in is not supported.</dd>
+ * <dt>auth/unverified-email</dt>
+ * <dd>Thrown if the email of the account is not verified.</dd>
+ * <dt>auth/requires-recent-login</dt>
+ * <dd>Thrown if the user's last sign-in time does not meet the security
+ *     threshold. Use {@link firebase.User.reauthenticateWithCredential} to
+ *     resolve.</dd>
+ * </dl>
+ *
+ * @example
+ * ```javascript
+ * firebase.auth().currentUser.multiFactor.getSession()
+ *     .then(function(multiFactorSession) {
+ *       // Send verification code
+ *     var phoneAuthProvider = new firebase.auth.PhoneAuthProvider();
+ *     var phoneInfoOptions = {
+ *       phoneNumber: phoneNumber,
+ *       session: multiFactorSession
+ *     };
+ *     return phoneAuthProvider.verifyPhoneNumber(
+ *         phoneInfoOptions, appVerifier);
+ *     }).then(function(verificationId) {
+ *       // Store verificationID and show UI to let user enter verification
+ *       // code.
+ *     });
+ *
+ * var phoneAuthCredential =
+ *     firebase.auth.PhoneAuthProvider.credential(
+ *         verificationId, verificationCode);
+ * var multiFactorAssertion =
+ *     firebase.auth.PhoneMultiFactorGenerator.assertion(phoneAuthCredential);
+ * firebase.auth().currentUser.multiFactor.enroll(multiFactorAssertion)
+ *     .then(function() {
+ *       // Second factor enrolled.
+ *     });
+ * ```
+ *
+ * @param {!firebase.auth.MultiFactorAssertion} assertion The multi-factor
+ *     assertion to enroll with.
+ * @param {?string=} displayName The display name of the second factor.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.MultiFactorUser.prototype.enroll = function (
+  assertion,
+  displayName
+) {};
+
+/**
+ * Returns the session identifier for a second factor enrollment operation.
+ * This is used to identify the current user trying to enroll a second factor.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/user-token-expired</dt>
+ * <dd>Thrown if the token of the user is expired.</dd>
+ * </dl>
+ *
+ * @return {!firebase.Promise<!firebase.auth.MultiFactorSession>} The promise
+ *     that resolves with the {@link firebase.auth.MultiFactorSession}.
+ */
+firebase.User.MultiFactorUser.prototype.getSession = function () {};
+
+/**
+ * Unenrolls the specified second factor. To specify the factor to remove, pass
+ * a {@link firebase.auth.MultiFactorInfo} object
+ * (retrieved from <code>enrolledFactors()</code>)
+ * or the factor's UID string.
+ * Sessions are not revoked when the account is downgraded. An email
+ * notification is likely to be sent to the user notifying them of the change.
+ * Recent re-authentication is required for this operation to succeed.
+ * When an existing factor is unenrolled, an email notification is sent to the
+ * user’s email.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/multi-factor-info-not-found</dt>
+ * <dd>Thrown if the user does not have a second factor matching the
+ *     identifier provided.</dd>
+ * <dt>auth/requires-recent-login</dt>
+ * <dd>Thrown if the user's last sign-in time does not meet the security
+ *     threshold. Use {@link firebase.User.reauthenticateWithCredential} to
+ *     resolve.</dd>
+ * </dl>
+ *
+ * @example
+ * ```javascript
+ * var options = firebase.auth().currentUser.multiFactor.enrolledFactors;
+ * // Present user the option to unenroll.
+ * return firebase.auth().currentUser.multiFactor.unenroll(options[i])
+ *   .then(function() {
+ *     // User successfully unenrolled selected factor.
+ *   }).catch(function(error) {
+ *     // Handler error.
+ *   });
+ * ```
+ *
+ * @param {!firebase.auth.MultiFactorInfo|string} option The multi-factor
+ *     option to unenroll.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.MultiFactorUser.prototype.unenroll = function (option) {};
diff --git a/firebase-externs/firebase-client-auth-externs.js b/firebase-externs/firebase-client-auth-externs.js
new file mode 100644
index 00000000..3cd0a877
--- /dev/null
+++ b/firebase-externs/firebase-client-auth-externs.js
@@ -0,0 +1,502 @@
+/**
+ * @license Copyright 2017 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Firebase client Auth API.
+ * @externs
+ */
+
+/**
+ * Links the authenticated provider to the user account using a pop-up based
+ * OAuth flow.
+ *
+ * If the linking is successful, the returned result will contain the user
+ * and the provider's credential.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/auth-domain-config-required</dt>
+ * <dd>Thrown if authDomain configuration is not provided when calling
+ *     firebase.initializeApp(). Check Firebase Console for instructions on
+ *     determining and passing that field.</dd>
+ * <dt>auth/cancelled-popup-request</dt>
+ * <dd>Thrown if successive popup operations are triggered. Only one popup
+ *     request is allowed at one time on a user or an auth instance. All the
+ *     popups would fail with this error except for the last one.</dd>
+ * <dt>auth/credential-already-in-use</dt>
+ * <dd>Thrown if the account corresponding to the credential already exists
+ *     among your users, or is already linked to a Firebase User.
+ *     For example, this error could be thrown if you are upgrading an anonymous
+ *     user to a Google user by linking a Google credential to it and the Google
+ *     credential used is already associated with an existing Firebase Google
+ *     user.
+ *     An <code>error.email</code> and <code>error.credential</code>
+ *     ({@link firebase.auth.AuthCredential}) fields are also provided. You can
+ *     recover from this error by signing in with that credential directly via
+ *     {@link firebase.auth.Auth#signInWithCredential}.</dd>
+ * <dt>auth/email-already-in-use</dt>
+ * <dd>Thrown if the email corresponding to the credential already exists
+ *     among your users. When thrown while linking a credential to an existing
+ *     user, an <code>error.email</code> and <code>error.credential</code>
+ *     ({@link firebase.auth.AuthCredential}) fields are also provided.
+ *     You have to link the credential to the existing user with that email if
+ *     you wish to continue signing in with that credential. To do so, call
+ *     {@link firebase.auth.Auth#fetchProvidersForEmail}, sign in to
+ *     <code>error.email</code> via one of the providers returned and then
+ *     {@link firebase.User#linkWithCredential} the original credential to that
+ *     newly signed in user.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if you have not enabled the provider in the Firebase Console. Go
+ *     to the Firebase Console for your project, in the Auth section and the
+ *     <strong>Sign in Method</strong> tab and configure the provider.</dd>
+ * <dt>auth/popup-blocked</dt>
+ * <dt>auth/operation-not-supported-in-this-environment</dt>
+ * <dd>Thrown if this operation is not supported in the environment your
+ *     application is running on. "location.protocol" must be http or https.
+ *     </dd>
+ * <dd>Thrown if the popup was blocked by the browser, typically when this
+ *     operation is triggered outside of a click handler.</dd>
+ * <dt>auth/popup-closed-by-user</dt>
+ * <dd>Thrown if the popup window is closed by the user without completing the
+ *     sign in to the provider.</dd>
+ * <dt>auth/provider-already-linked</dt>
+ * <dd>Thrown if the provider has already been linked to the user. This error is
+ *     thrown even if this is not the same provider's account that is currently
+ *     linked to the user.</dd>
+ * <dt>auth/unauthorized-domain</dt>
+ * <dd>Thrown if the app domain is not authorized for OAuth operations for your
+ *     Firebase project. Edit the list of authorized domains from the Firebase
+ *     console.</dd>
+ * </dl>
+ *
+ * @example
+ * // Creates the provider object.
+ * var provider = new firebase.auth.FacebookAuthProvider();
+ * // You can add additional scopes to the provider:
+ * provider.addScope('email');
+ * provider.addScope('user_friends');
+ * // Link with popup:
+ * user.linkWithPopup(provider).then(function(result) {
+ *   // The firebase.User instance:
+ *   var user = result.user;
+ *   // The Facebook firebase.auth.AuthCredential containing the Facebook
+ *   // access token:
+ *   var credential = result.credential;
+ * }, function(error) {
+ *   // An error happened.
+ * });
+ *
+ * @param {!firebase.auth.AuthProvider} provider The provider to authenticate.
+ *     The provider has to be an OAuth provider. Non-OAuth providers like {@link
+ *     firebase.auth.EmailAuthProvider} will throw an error.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.User.prototype.linkWithPopup = function (provider) {};
+
+/**
+ * Links the authenticated provider to the user account using a full-page
+ * redirect flow.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/auth-domain-config-required</dt>
+ * <dd>Thrown if authDomain configuration is not provided when calling
+ *     firebase.initializeApp(). Check Firebase Console for instructions on
+ *     determining and passing that field.</dd>
+ * <dt>auth/operation-not-supported-in-this-environment</dt>
+ * <dd>Thrown if this operation is not supported in the environment your
+ *     application is running on. "location.protocol" must be http or https.
+ *     </dd>
+ * <dt>auth/provider-already-linked</dt>
+ * <dd>Thrown if the provider has already been linked to the user. This error is
+ *     thrown even if this is not the same provider's account that is currently
+ *     linked to the user.</dd>
+ * <dt>auth/unauthorized-domain</dt>
+ * <dd>Thrown if the app domain is not authorized for OAuth operations for your
+ *     Firebase project. Edit the list of authorized domains from the Firebase
+ *     console.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.AuthProvider} provider The provider to authenticate.
+ *     The provider has to be an OAuth provider. Non-OAuth providers like {@link
+ *     firebase.auth.EmailAuthProvider} will throw an error.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.linkWithRedirect = function (provider) {};
+
+/**
+ * Authenticates a Firebase client using a popup-based OAuth authentication
+ * flow.
+ *
+ * If succeeds, returns the signed in user along with the provider's credential.
+ * If sign in was unsuccessful, returns an error object containing additional
+ * information about the error.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/account-exists-with-different-credential</dt>
+ * <dd>Thrown if there already exists an account with the email address
+ *     asserted by the credential. Resolve this by calling
+ *     {@link firebase.auth.Auth#fetchProvidersForEmail} with the error.email
+ *     and then asking the user to sign in using one of the returned providers.
+ *     Once the user is signed in, the original credential retrieved from the
+ *     error.credential can be linked to the user with
+ *     {@link firebase.User#linkWithCredential} to prevent the user from signing
+ *     in again to the original provider via popup or redirect. If you are using
+ *     redirects for sign in, save the credential in session storage and then
+ *     retrieve on redirect and repopulate the credential using for example
+ *     {@link firebase.auth.GoogleAuthProvider#credential} depending on the
+ *     credential provider id and complete the link.</dd>
+ * <dt>auth/auth-domain-config-required</dt>
+ * <dd>Thrown if authDomain configuration is not provided when calling
+ *     firebase.initializeApp(). Check Firebase Console for instructions on
+ *     determining and passing that field.</dd>
+ * <dt>auth/cancelled-popup-request</dt>
+ * <dd>Thrown if successive popup operations are triggered. Only one popup
+ *     request is allowed at one time. All the popups would fail with this error
+ *     except for the last one.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if the type of account corresponding to the credential
+ *     is not enabled. Enable the account type in the Firebase Console, under
+ *     the Auth tab.</dd>
+ * <dt>auth/operation-not-supported-in-this-environment</dt>
+ * <dd>Thrown if this operation is not supported in the environment your
+ *     application is running on. "location.protocol" must be http or https.
+ *     </dd>
+ * <dt>auth/popup-blocked</dt>
+ * <dd>Thrown if the popup was blocked by the browser, typically when this
+ *     operation is triggered outside of a click handler.</dd>
+ * <dt>auth/popup-closed-by-user</dt>
+ * <dd>Thrown if the popup window is closed by the user without completing the
+ *     sign in to the provider.</dd>
+ * <dt>auth/unauthorized-domain</dt>
+ * <dd>Thrown if the app domain is not authorized for OAuth operations for your
+ *     Firebase project. Edit the list of authorized domains from the Firebase
+ *     console.</dd>
+ * </dl>
+ *
+ * @example
+ * // Creates the provider object.
+ * var provider = new firebase.auth.FacebookAuthProvider();
+ * // You can add additional scopes to the provider:
+ * provider.addScope('email');
+ * provider.addScope('user_friends');
+ * // Sign in with popup:
+ * auth.signInWithPopup(provider).then(function(result) {
+ *   // The firebase.User instance:
+ *   var user = result.user;
+ *   // The Facebook firebase.auth.AuthCredential containing the Facebook
+ *   // access token:
+ *   var credential = result.credential;
+ * }, function(error) {
+ *   // The provider's account email, can be used in case of
+ *   // auth/account-exists-with-different-credential to fetch the providers
+ *   // linked to the email:
+ *   var email = error.email;
+ *   // The provider's credential:
+ *   var credential = error.credential;
+ *   // In case of auth/account-exists-with-different-credential error,
+ *   // you can fetch the providers using this:
+ *   if (error.code === 'auth/account-exists-with-different-credential') {
+ *     auth.fetchProvidersForEmail(email).then(function(providers) {
+ *       // The returned 'providers' is a list of the available providers
+ *       // linked to the email address. Please refer to the guide for a more
+ *       // complete explanation on how to recover from this error.
+ *     });
+ *   }
+ * });
+ *
+ * @param {!firebase.auth.AuthProvider} provider The provider to authenticate.
+ *     The provider has to be an OAuth provider. Non-OAuth providers like {@link
+ *     firebase.auth.EmailAuthProvider} will throw an error.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.signInWithPopup = function (provider) {};
+
+/**
+ * Authenticates a Firebase client using a full-page redirect flow. To handle
+ * the results and errors for this operation, refer to {@link
+ * firebase.auth.Auth#getRedirectResult}.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/auth-domain-config-required</dt>
+ * <dd>Thrown if authDomain configuration is not provided when calling
+ *     firebase.initializeApp(). Check Firebase Console for instructions on
+ *     determining and passing that field.</dd>
+ * <dt>auth/operation-not-supported-in-this-environment</dt>
+ * <dd>Thrown if this operation is not supported in the environment your
+ *     application is running on. "location.protocol" must be http or https.
+ *     </dd>
+ * <dt>auth/unauthorized-domain</dt>
+ * <dd>Thrown if the app domain is not authorized for OAuth operations for your
+ *     Firebase project. Edit the list of authorized domains from the Firebase
+ *     console.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.AuthProvider} provider The provider to authenticate.
+ *     The provider has to be an OAuth provider. Non-OAuth providers like {@link
+ *     firebase.auth.EmailAuthProvider} will throw an error.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.auth.Auth.prototype.signInWithRedirect = function (provider) {};
+
+/**
+ * Reauthenticates the current user with the specified provider using a pop-up
+ * based OAuth flow.
+ *
+ * If the reauthentication is successful, the returned result will contain the
+ * user and the provider's credential.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/auth-domain-config-required</dt>
+ * <dd>Thrown if authDomain configuration is not provided when calling
+ *     firebase.initializeApp(). Check Firebase Console for instructions on
+ *     determining and passing that field.</dd>
+ * <dt>auth/cancelled-popup-request</dt>
+ * <dd>Thrown if successive popup operations are triggered. Only one popup
+ *     request is allowed at one time on a user or an auth instance. All the
+ *     popups would fail with this error except for the last one.</dd>
+ * <dt>auth/user-mismatch</dt>
+ * <dd>Thrown if the credential given does not correspond to the user.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if you have not enabled the provider in the Firebase Console. Go
+ *     to the Firebase Console for your project, in the Auth section and the
+ *     <strong>Sign in Method</strong> tab and configure the provider.</dd>
+ * <dt>auth/popup-blocked</dt>
+ * <dd>Thrown if the popup was blocked by the browser, typically when this
+ *     operation is triggered outside of a click handler.</dd>
+ * <dt>auth/operation-not-supported-in-this-environment</dt>
+ * <dd>Thrown if this operation is not supported in the environment your
+ *     application is running on. "location.protocol" must be http or https.
+ *     </dd>
+ * <dt>auth/popup-closed-by-user</dt>
+ * <dd>Thrown if the popup window is closed by the user without completing the
+ *     sign in to the provider.</dd>
+ * <dt>auth/unauthorized-domain</dt>
+ * <dd>Thrown if the app domain is not authorized for OAuth operations for your
+ *     Firebase project. Edit the list of authorized domains from the Firebase
+ *     console.</dd>
+ * </dl>
+ *
+ * @example
+ * // Creates the provider object.
+ * var provider = new firebase.auth.FacebookAuthProvider();
+ * // You can add additional scopes to the provider:
+ * provider.addScope('email');
+ * provider.addScope('user_friends');
+ * // Reauthenticate with popup:
+ * user.reauthenticateWithPopup(provider).then(function(result) {
+ *   // The firebase.User instance:
+ *   var user = result.user;
+ *   // The Facebook firebase.auth.AuthCredential containing the Facebook
+ *   // access token:
+ *   var credential = result.credential;
+ * }, function(error) {
+ *   // An error happened.
+ * });
+ *
+ * @param {!firebase.auth.AuthProvider} provider The provider to authenticate.
+ *     The provider has to be an OAuth provider. Non-OAuth providers like {@link
+ *     firebase.auth.EmailAuthProvider} will throw an error.
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.User.prototype.reauthenticateWithPopup = function (provider) {};
+
+/**
+ * Reauthenticates the current user with the specified OAuth provider using a
+ * full-page redirect flow.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/auth-domain-config-required</dt>
+ * <dd>Thrown if authDomain configuration is not provided when calling
+ *     firebase.initializeApp(). Check Firebase Console for instructions on
+ *     determining and passing that field.</dd>
+ * <dt>auth/operation-not-supported-in-this-environment</dt>
+ * <dd>Thrown if this operation is not supported in the environment your
+ *     application is running on. "location.protocol" must be http or https.
+ *     </dd>
+ * <dt>auth/user-mismatch</dt>
+ * <dd>Thrown if the credential given does not correspond to the user.</dd>
+ * <dt>auth/unauthorized-domain</dt>
+ * <dd>Thrown if the app domain is not authorized for OAuth operations for your
+ *     Firebase project. Edit the list of authorized domains from the Firebase
+ *     console.</dd>
+ * </dl>
+ *
+ * @param {!firebase.auth.AuthProvider} provider The provider to authenticate.
+ *     The provider has to be an OAuth provider. Non-OAuth providers like {@link
+ *     firebase.auth.EmailAuthProvider} will throw an error.
+ * @return {!firebase.Promise<void>}
+ */
+firebase.User.prototype.reauthenticateWithRedirect = function (provider) {};
+
+/**
+ * Returns a UserCredential from the redirect-based sign-in flow.
+ *
+ * If sign-in succeeded, returns the signed in user. If sign-in was
+ * unsuccessful, fails with an error. If no redirect operation was called,
+ * returns a UserCredential with a null User.
+ *
+ * <h4>Error Codes</h4>
+ * <dl>
+ * <dt>auth/account-exists-with-different-credential</dt>
+ * <dd>Thrown if there already exists an account with the email address
+ *     asserted by the credential. Resolve this by calling
+ *     {@link firebase.auth.Auth#fetchProvidersForEmail} with the error.email
+ *     and then asking the user to sign in using one of the returned providers.
+ *     Once the user is signed in, the original credential retrieved from the
+ *     error.credential can be linked to the user with
+ *     {@link firebase.User#linkWithCredential} to prevent the user from signing
+ *     in again to the original provider via popup or redirect. If you are using
+ *     redirects for sign in, save the credential in session storage and then
+ *     retrieve on redirect and repopulate the credential using for example
+ *     {@link firebase.auth.GoogleAuthProvider#credential} depending on the
+ *     credential provider id and complete the link.</dd>
+ * <dt>auth/auth-domain-config-required</dt>
+ * <dd>Thrown if authDomain configuration is not provided when calling
+ *     firebase.initializeApp(). Check Firebase Console for instructions on
+ *     determining and passing that field.</dd>
+ * <dt>auth/credential-already-in-use</dt>
+ * <dd>Thrown if the account corresponding to the credential already exists
+ *     among your users, or is already linked to a Firebase User.
+ *     For example, this error could be thrown if you are upgrading an anonymous
+ *     user to a Google user by linking a Google credential to it and the Google
+ *     credential used is already associated with an existing Firebase Google
+ *     user.
+ *     An <code>error.email</code> and <code>error.credential</code>
+ *     ({@link firebase.auth.AuthCredential}) fields are also provided. You can
+ *     recover from this error by signing in with that credential directly via
+ *     {@link firebase.auth.Auth#signInWithCredential}.</dd>
+ * <dt>auth/email-already-in-use</dt>
+ * <dd>Thrown if the email corresponding to the credential already exists
+ *     among your users. When thrown while linking a credential to an existing
+ *     user, an <code>error.email</code> and <code>error.credential</code>
+ *     ({@link firebase.auth.AuthCredential}) fields are also provided.
+ *     You have to link the credential to the existing user with that email if
+ *     you wish to continue signing in with that credential. To do so, call
+ *     {@link firebase.auth.Auth#fetchProvidersForEmail}, sign in to
+ *     <code>error.email</code> via one of the providers returned and then
+ *     {@link firebase.User#linkWithCredential} the original credential to that
+ *     newly signed in user.</dd>
+ * <dt>auth/operation-not-allowed</dt>
+ * <dd>Thrown if the type of account corresponding to the credential
+ *     is not enabled. Enable the account type in the Firebase Console, under
+ *     the Auth tab.</dd>
+ * <dt>auth/operation-not-supported-in-this-environment</dt>
+ * <dd>Thrown if this operation is not supported in the environment your
+ *     application is running on. "location.protocol" must be http or https.
+ *     </dd>
+ * <dt>auth/timeout</dt>
+ * <dd>Thrown typically if the app domain is not authorized for OAuth operations
+ *     for your Firebase project. Edit the list of authorized domains from the
+ *     Firebase console.</dd>
+ * </dl>
+ *
+ * @example
+ * // First, we perform the signInWithRedirect.
+ * // Creates the provider object.
+ * var provider = new firebase.auth.FacebookAuthProvider();
+ * // You can add additional scopes to the provider:
+ * provider.addScope('email');
+ * provider.addScope('user_friends');
+ * // Sign in with redirect:
+ * auth.signInWithRedirect(provider)
+ * ////////////////////////////////////////////////////////////
+ * // The user is redirected to the provider's sign in flow...
+ * ////////////////////////////////////////////////////////////
+ * // Then redirected back to the app, where we check the redirect result:
+ * auth.getRedirectResult().then(function(result) {
+ *   // The firebase.User instance:
+ *   var user = result.user;
+ *   // The Facebook firebase.auth.AuthCredential containing the Facebook
+ *   // access token:
+ *   var credential = result.credential;
+ *   // As this API can be used for sign-in, linking and reauthentication,
+ *   // check the operationType to determine what triggered this redirect
+ *   // operation.
+ *   var operationType = result.operationType;
+ * }, function(error) {
+ *   // The provider's account email, can be used in case of
+ *   // auth/account-exists-with-different-credential to fetch the providers
+ *   // linked to the email:
+ *   var email = error.email;
+ *   // The provider's credential:
+ *   var credential = error.credential;
+ *   // In case of auth/account-exists-with-different-credential error,
+ *   // you can fetch the providers using this:
+ *   if (error.code === 'auth/account-exists-with-different-credential') {
+ *     auth.fetchProvidersForEmail(email).then(function(providers) {
+ *       // The returned 'providers' is a list of the available providers
+ *       // linked to the email address. Please refer to the guide for a more
+ *       // complete explanation on how to recover from this error.
+ *     });
+ *   }
+ * });
+ *
+ * @return {!firebase.Promise<!firebase.auth.UserCredential>}
+ */
+firebase.auth.Auth.prototype.getRedirectResult = function () {};
+
+/**
+ * An {@link https://www.google.com/recaptcha/ reCAPTCHA}-based application
+ * verifier.
+ * @param {!Element|string} container The reCAPTCHA container parameter. This
+ *     has different meaning depending on whether the reCAPTCHA is hidden or
+ *     visible. For a visible reCAPTCHA the container must be empty. If a string
+ *     is used, it has to correspond to an element ID. The corresponding element
+ *     must also must be in the DOM at the time of initialization.
+ * @param {?Object=} parameters The optional reCAPTCHA parameters. Check the
+ *     reCAPTCHA docs for a comprehensive list. All parameters are accepted
+ *     except for the sitekey. Firebase Auth backend provisions a reCAPTCHA for
+ *     each project and will configure this upon rendering. For an invisible
+ *     reCAPTCHA, a size key must have the value 'invisible'.
+ * @param {?firebase.app.App=} app The corresponding Firebase app. If none is
+ *     provided, the default Firebase App instance is used. A Firebase App
+ *     instance must be initialized with an API key, otherwise an error will be
+ *     thrown.
+ * @constructor
+ * @implements {firebase.auth.ApplicationVerifier}
+ */
+firebase.auth.RecaptchaVerifier = function (container, parameters, app) {};
+
+/**
+ * The application verifier type. For a reCAPTCHA verifier, this is 'recaptcha'.
+ * @type {string}
+ */
+firebase.auth.RecaptchaVerifier.prototype.type;
+
+/**
+ * Clears the reCAPTCHA widget from the page and destroys the current instance.
+ */
+firebase.auth.RecaptchaVerifier.prototype.clear = function () {};
+
+/**
+ * Renders the reCAPTCHA widget on the page.
+ * @return {!firebase.Promise<number>} A Promise that resolves with the
+ *     reCAPTCHA widget ID.
+ */
+firebase.auth.RecaptchaVerifier.prototype.render = function () {};
+
+/**
+ * Waits for the user to solve the reCAPTCHA and resolves with the reCAPTCHA
+ * token.
+ * @return {!firebase.Promise<string>} A Promise for the reCAPTCHA token.
+ * @override
+ */
+firebase.auth.RecaptchaVerifier.prototype.verify = function () {};
diff --git a/firebaseuihandler/README.md b/firebaseuihandler/README.md
index 4a37d7ef..30c37517 100644
--- a/firebaseuihandler/README.md
+++ b/firebaseuihandler/README.md
@@ -53,8 +53,8 @@ You can then `import` the following modules within your source files:
 
 ```javascript
 // Import firebase modules.
-import * as firebase from "firebase/app";
-import "firebase/auth";
+import firebase from "firebase/compat/app";
+import "firebase/compat/auth";
 // Import firebaseui module.
 import * as firebaseui from 'firebaseui'
 // Import gcip-iap module.
@@ -65,8 +65,8 @@ Or use cjs `require` to include the modules:
 
 ```javascript
 // Require firebase modules.
-var firebase = require('firebase/app');
-require('firebase/auth');
+var firebase = require('firebase/compat/app');
+require('firebase/compat/auth');
 // Require firebaseui module.
 var firebaseui = require('firebaseui');
 // Require gcip-iap module.
diff --git a/gulpfile.js b/gulpfile.js
index 081d4807..79608ea2 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -64,8 +64,8 @@ const MDL_COMPONENTS = [
 
 // The external dependencies needed by FirebaseUI as ES module imports.
 const ESM_DEPS = [
-  'import firebase from \'firebase/app\'',
-  'import \'firebase/auth\'',
+  'import firebase from \'firebase/compat/app\'',
+  'import \'firebase/compat/auth\'',
   'import dialogPolyfill from \'dialog-polyfill\'',
 ].concat(MDL_COMPONENTS.map(component => `import \'material-design-lite/src/${component}\'`));
 
@@ -83,11 +83,11 @@ const ESM_EXPORT = 'var auth = firebaseui.auth;' +
 
 // Adds the cjs module requirement and exports firebaseui.
 const NPM_MODULE_WRAPPER = OPTIMIZATION_LEVEL === 'WHITESPACE_ONLY' ?
-    'var firebase=require(\'firebase/app\');require(\'firebase/auth\');' +
+    'var firebase=require(\'firebase/compat/app\');require(\'firebase/compat/auth\');' +
     DEFAULT_IMPORT_FIX + '%output%' + DIALOG_POLYFILL +
     'module.exports=firebaseui;' :
-    '(function() { var firebase=require(\'firebase/app\');' +
-    'require(\'firebase/auth\');' + DEFAULT_IMPORT_FIX + '%output% ' +
+    '(function() { var firebase=require(\'firebase/compat/app\');' +
+    'require(\'firebase/compat/auth\');' + DEFAULT_IMPORT_FIX + '%output% ' +
     DIALOG_POLYFILL + '})();' + 'module.exports=firebaseui;';
 
 // Adds the module requirement and exports firebaseui.
@@ -222,9 +222,9 @@ function buildFirebaseUiJs(locale) {
     closure_entry_point: 'firebaseui.auth.exports',
     define: `goog.LOCALE='${locale}'`,
     externs: [
-      'node_modules/firebase/externs/firebase-app-externs.js',
-      'node_modules/firebase/externs/firebase-auth-externs.js',
-      'node_modules/firebase/externs/firebase-client-auth-externs.js'
+      'firebase-externs/firebase-app-externs.js',
+      'firebase-externs/firebase-auth-externs.js',
+      'firebase-externs/firebase-client-auth-externs.js'
     ],
     only_closure_dependencies: true,
     output_wrapper: OUTPUT_WRAPPER,
diff --git a/package-lock.json b/package-lock.json
index aeebf5df..db85bea8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "firebaseui",
-  "version": "5.0.0",
+  "version": "6.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -16,12 +16,6 @@
         "js-yaml": "^4.1.0"
       },
       "dependencies": {
-        "argparse": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
-          "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
-          "dev": true
-        },
         "js-yaml": {
           "version": "4.1.0",
           "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
@@ -45,51 +39,71 @@
       }
     },
     "@firebase/analytics": {
-      "version": "0.6.14",
-      "resolved": "https://registry.npmjs.org/@firebase/analytics/-/analytics-0.6.14.tgz",
-      "integrity": "sha512-u7e9MreZOuv6VHhJvfp2UzNvNXac5QL2ofNhcQmwxUrMyHX80LUJrTLUCoaCpQvv3HJHX8WVj897a9LoB4OO1g==",
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/@firebase/analytics/-/analytics-0.7.2.tgz",
+      "integrity": "sha512-YxLsPojufkfe3FFg6imOMQdfdJwu5hig17jnldpdmqemj1gOIwE/peTBrksP4rxnIra26XhsBRppcPcVQyxMNQ==",
       "dev": true,
       "requires": {
-        "@firebase/analytics-types": "0.4.0",
-        "@firebase/component": "0.5.4",
-        "@firebase/installations": "0.4.30",
-        "@firebase/logger": "0.2.6",
-        "@firebase/util": "1.1.0",
+        "@firebase/component": "0.5.7",
+        "@firebase/installations": "0.5.2",
+        "@firebase/logger": "0.3.0",
+        "@firebase/util": "1.4.0",
+        "tslib": "^2.1.0"
+      }
+    },
+    "@firebase/analytics-compat": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@firebase/analytics-compat/-/analytics-compat-0.1.3.tgz",
+      "integrity": "sha512-FpaJ4sbJnryCRBkKIE45L2wGt2oCmlRK+AZc4JQHw20vb8Mf1WG1qGO+FGNoFev3lJSAd21tyhoLdPvbCTnOZQ==",
+      "dev": true,
+      "requires": {
+        "@firebase/analytics": "0.7.2",
+        "@firebase/analytics-types": "0.7.0",
+        "@firebase/component": "0.5.7",
+        "@firebase/util": "1.4.0",
         "tslib": "^2.1.0"
       }
     },
     "@firebase/analytics-types": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/@firebase/analytics-types/-/analytics-types-0.4.0.tgz",
-      "integrity": "sha512-Jj2xW+8+8XPfWGkv9HPv/uR+Qrmq37NPYT352wf7MvE9LrstpLVmFg3LqG6MCRr5miLAom5sen2gZ+iOhVDeRA==",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@firebase/analytics-types/-/analytics-types-0.7.0.tgz",
+      "integrity": "sha512-DNE2Waiwy5+zZnCfintkDtBfaW6MjIG883474v6Z0K1XZIvl76cLND4iv0YUb48leyF+PJK1KO2XrgHb/KpmhQ==",
       "dev": true
     },
     "@firebase/app": {
-      "version": "0.6.28",
-      "resolved": "https://registry.npmjs.org/@firebase/app/-/app-0.6.28.tgz",
-      "integrity": "sha512-ZsR5372bNDfY9aGMg+0zgoxwUg/Upf8Mq1M82XCByCVdn6krnPwGr486UssiYFCVANweiOR1Mrhrg2y5O01RRw==",
+      "version": "0.7.4",
+      "resolved": "https://registry.npmjs.org/@firebase/app/-/app-0.7.4.tgz",
+      "integrity": "sha512-XBrZb60m7N1XqmRhSJWADDD3J/0j9wM2VhxC5KUEtFA9SWfTn9Z3EWGtRGz7ahrMkgPJsmo0fXpvUh6cY8pQvQ==",
       "dev": true,
       "requires": {
-        "@firebase/app-types": "0.6.2",
-        "@firebase/component": "0.5.4",
-        "@firebase/logger": "0.2.6",
-        "@firebase/util": "1.1.0",
-        "dom-storage": "2.1.0",
-        "tslib": "^2.1.0",
-        "xmlhttprequest": "1.8.0"
+        "@firebase/component": "0.5.7",
+        "@firebase/logger": "0.3.0",
+        "@firebase/util": "1.4.0",
+        "tslib": "^2.1.0"
       }
     },
     "@firebase/app-check": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/@firebase/app-check/-/app-check-0.2.0.tgz",
-      "integrity": "sha512-h5eNSYf4ZU9FGawDSLGSGBcaYzdkydVBCGzbQW5urAd7czhB5QF+T4nnTOQ0Gto5upqPGuUH9s9CbQ4Gf49OEw==",
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/@firebase/app-check/-/app-check-0.4.2.tgz",
+      "integrity": "sha512-DFYt22lUMvvncN3v6x9ZRE2/HHBQdRQyYtHwakAcZrRUALJiU16iDwl2CABuW4JKytTmMj+xXo0fjSIRWtwT/w==",
       "dev": true,
       "requires": {
-        "@firebase/app-check-interop-types": "0.1.0",
-        "@firebase/app-check-types": "0.2.0",
-        "@firebase/component": "0.5.4",
-        "@firebase/logger": "0.2.6",
-        "@firebase/util": "1.1.0",
+        "@firebase/component": "0.5.7",
+        "@firebase/logger": "0.3.0",
+        "@firebase/util": "1.4.0",
+        "tslib": "^2.1.0"
+      }
+    },
+    "@firebase/app-check-compat": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@firebase/app-check-compat/-/app-check-compat-0.1.3.tgz",
+      "integrity": "sha512-ka5ggmfucQDwEJTcFsXPJJ+ygPZz4Q44D5yb0sksfOAsUSpzAR83jDSxebOgTvvk+axNCFamxOsrZEV6KKDjEg==",
+      "dev": true,
+      "requires": {
+        "@firebase/app-check": "0.4.2",
+        "@firebase/component": "0.5.7",
+        "@firebase/logger": "0.3.0",
+        "@firebase/util": "1.4.0",
         "tslib": "^2.1.0"
       }
     },
@@ -99,25 +113,144 @@
       "integrity": "sha512-uZfn9s4uuRsaX5Lwx+gFP3B6YsyOKUE+Rqa6z9ojT4VSRAsZFko9FRn6OxQUA1z5t5d08fY4pf+/+Dkd5wbdbA==",
       "dev": true
     },
-    "@firebase/app-check-types": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/@firebase/app-check-types/-/app-check-types-0.2.0.tgz",
-      "integrity": "sha512-CfZhWtChLK9uNmrxbJyTg1BPtROiwc/VJGu3f39KjS0F5ZvZjHmyRFMrDiSoXDoybM4B6X0pQhJYi9rifT2wpQ==",
-      "dev": true
+    "@firebase/app-compat": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/@firebase/app-compat/-/app-compat-0.1.5.tgz",
+      "integrity": "sha512-GJURp5Nn8dEm72/y13Z+XMvWmMomsYViNxw6VKYqVH9f9VKnJ46Q8zYtx2ePvOuj7pAqsfwNkvAdAFYcveTe9g==",
+      "dev": true,
+      "requires": {
+        "@firebase/app": "0.7.4",
+        "@firebase/component": "0.5.7",
+        "@firebase/logger": "0.3.0",
+        "@firebase/util": "1.4.0",
+        "tslib": "^2.1.0"
+      }
     },
     "@firebase/app-types": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/@firebase/app-types/-/app-types-0.6.2.tgz",
-      "integrity": "sha512-2VXvq/K+n8XMdM4L2xy5bYp2ZXMawJXluUIDzUBvMthVR+lhxK4pfFiqr1mmDbv9ydXvEAuFsD+6DpcZuJcSSw==",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@firebase/app-types/-/app-types-0.7.0.tgz",
+      "integrity": "sha512-6fbHQwDv2jp/v6bXhBw2eSRbNBpxHcd1NBF864UksSMVIqIyri9qpJB1Mn6sGZE+bnDsSQBC5j2TbMxYsJQkQg==",
       "dev": true
     },
     "@firebase/auth": {
-      "version": "0.16.8",
-      "resolved": "https://registry.npmjs.org/@firebase/auth/-/auth-0.16.8.tgz",
-      "integrity": "sha512-mR0UXG4LirWIfOiCWxVmvz1o23BuKGxeItQ2cCUgXLTjNtWJXdcky/356iTUsd7ZV5A78s2NHeN5tIDDG6H4rg==",
+      "version": "0.18.3",
+      "resolved": "https://registry.npmjs.org/@firebase/auth/-/auth-0.18.3.tgz",
+      "integrity": "sha512-uS67CzypGu52H94mkptJ/lpoc0xAtVDksb/4+4HdSRwekxMt5EtyEdLMy8MH73Vk3MwTQWyTEsHEbwrGgk42pQ==",
+      "dev": true,
+      "requires": {
+        "@firebase/component": "0.5.7",
+        "@firebase/logger": "0.3.0",
+        "@firebase/util": "1.4.0",
+        "node-fetch": "2.6.5",
+        "selenium-webdriver": "4.0.0-rc-1",
+        "tslib": "^2.1.0"
+      },
+      "dependencies": {
+        "glob": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.0.tgz",
+          "integrity": "sha512-lmLf6gtyrPq8tTjSmrO94wBeQbFR3HbLHbuyD69wuyQkImp2hWqMGB47OX65FBkPffO641IP9jWa1z4ivqG26Q==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        },
+        "node-fetch": {
+          "version": "2.6.5",
+          "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.5.tgz",
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+          "dev": true,
+          "requires": {
+            "whatwg-url": "^5.0.0"
+          }
+        },
+        "rimraf": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
+          "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
+          "dev": true,
+          "requires": {
+            "glob": "^7.1.3"
+          }
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+        "selenium-webdriver": {
+          "version": "4.0.0-rc-1",
+          "resolved": "https://registry.npmjs.org/selenium-webdriver/-/selenium-webdriver-4.0.0-rc-1.tgz",
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+          "dev": true,
+          "requires": {
+            "jszip": "^3.6.0",
+            "rimraf": "^3.0.2",
+            "tmp": "^0.2.1",
+            "ws": ">=7.4.6"
+          }
+        }
+      }
+    },
+    "@firebase/auth-compat": {
+      "version": "0.1.6",
+      "resolved": "https://registry.npmjs.org/@firebase/auth-compat/-/auth-compat-0.1.6.tgz",
+      "integrity": "sha512-+HNIsti29ZX4AgLH4KdI+DAesX9DOywcmHFbVJtOE6Ow8v2d8NFTi66fa4LEU7HLCvj9YpeiEpHHLs4NamJ1tw==",
       "dev": true,
       "requires": {
-        "@firebase/auth-types": "0.10.3"
+        "@firebase/auth": "0.18.3",
+        "@firebase/auth-types": "0.11.0",
+        "@firebase/component": "0.5.7",
+        "@firebase/util": "1.4.0",
+        "node-fetch": "2.6.5",
+        "selenium-webdriver": "^4.0.0-beta.2",
+        "tslib": "^2.1.0"
+      },
+      "dependencies": {
+        "glob": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.0.tgz",
+          "integrity": "sha512-lmLf6gtyrPq8tTjSmrO94wBeQbFR3HbLHbuyD69wuyQkImp2hWqMGB47OX65FBkPffO641IP9jWa1z4ivqG26Q==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        },
+        "node-fetch": {
+          "version": "2.6.5",
+          "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.5.tgz",
+          "integrity": "sha512-mmlIVHJEu5rnIxgEgez6b9GgWXbkZj5YZ7fx+2r94a2E+Uirsp6HsPTPlomfdHtpt/B0cdKviwkoaM6pyvUOpQ==",
+          "dev": true,
+          "requires": {
+            "whatwg-url": "^5.0.0"
+          }
+        },
+        "rimraf": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
+          "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
+          "dev": true,
+          "requires": {
+            "glob": "^7.1.3"
+          }
+        },
+        "selenium-webdriver": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/selenium-webdriver/-/selenium-webdriver-4.0.0.tgz",
+          "integrity": "sha512-tOlu6FnTjPq2FKpd153pl8o2cB7H40Rvl/ogiD2sapMv4IDjQqpIxbd+swDJe9UDLdszeh5CDis6lgy4e9UG1w==",
+          "dev": true,
+          "requires": {
+            "jszip": "^3.6.0",
+            "rimraf": "^3.0.2",
+            "tmp": "^0.2.1",
+            "ws": ">=7.4.6"
+          }
+        }
       }
     },
     "@firebase/auth-interop-types": {
@@ -127,150 +260,234 @@
       "dev": true
     },
     "@firebase/auth-types": {
-      "version": "0.10.3",
-      "resolved": "https://registry.npmjs.org/@firebase/auth-types/-/auth-types-0.10.3.tgz",
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+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@firebase/auth-types/-/auth-types-0.11.0.tgz",
+      "integrity": "sha512-q7Bt6cx+ySj9elQHTsKulwk3+qDezhzRBFC9zlQ1BjgMueUOnGMcvqmU0zuKlQ4RhLSH7MNAdBV2znVaoN3Vxw==",
       "dev": true
     },
     "@firebase/component": {
-      "version": "0.5.4",
-      "resolved": "https://registry.npmjs.org/@firebase/component/-/component-0.5.4.tgz",
-      "integrity": "sha512-KoLDPTsvxWr6FT9kn/snffJItaWXZLHLJlZVKiiw+flKE6MVA8Eec+ctvM2zcsMZzC2Z47gFnVqywfBlOevmpQ==",
+      "version": "0.5.7",
+      "resolved": "https://registry.npmjs.org/@firebase/component/-/component-0.5.7.tgz",
+      "integrity": "sha512-CiAHUPXh2hn/lpzMShNmfAxHNQhKQwmQUJSYMPCjf2bCCt4Z2vLGpS+UWEuNFm9Zf8LNmkS+Z+U/s4Obi5carg==",
       "dev": true,
       "requires": {
-        "@firebase/util": "1.1.0",
+        "@firebase/util": "1.4.0",
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       }
     },
     "@firebase/database": {
-      "version": "0.10.7",
-      "resolved": "https://registry.npmjs.org/@firebase/database/-/database-0.10.7.tgz",
-      "integrity": "sha512-7BFj8LFhGL+TmLiPOffOVfkrO2wm44mGcT0jqrkTkt1KydapmjABFJBRvONvlLij5LoWrJK1cSuE8wYDQrDq2Q==",
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+      "resolved": "https://registry.npmjs.org/@firebase/database/-/database-0.12.2.tgz",
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-        "@firebase/logger": "0.2.6",
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-        "faye-websocket": "0.11.3",
+        "@firebase/component": "0.5.7",
+        "@firebase/logger": "0.3.0",
+        "@firebase/util": "1.4.0",
+        "faye-websocket": "0.11.4",
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+      }
+    },
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+      "dev": true,
+      "requires": {
+        "@firebase/component": "0.5.7",
+        "@firebase/database": "0.12.2",
+        "@firebase/database-types": "0.9.1",
+        "@firebase/logger": "0.3.0",
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-        "@firebase/app-types": "0.6.2"
+        "@firebase/app-types": "0.7.0",
+        "@firebase/util": "1.4.0"
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     "@firebase/firestore": {
-      "version": "2.3.8",
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-      "integrity": "sha512-76uA4czK+JM7rNbJXWrzA2gZQMGopQOvkQ7EffBfe9d921gvZ+W6naXaih+jYZn6BwuE7no9fx3RdZDszG5u+g==",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/@firebase/firestore/-/firestore-3.1.1.tgz",
+      "integrity": "sha512-hFl+Me6F+GhtEaMsmwruOVoaJfoYinjCKyhaXzQT/jUsoBzKUBCd6MKMjYD+D+y1deAmdkFJcRNxPV7CsgF2aw==",
       "dev": true,
       "requires": {
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+        "webidl-conversions": "^3.0.0"
+      }
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-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
-      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
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@@ -13676,12 +13992,12 @@
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-      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
-      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz",
+      "integrity": "sha512-eDMORYaPNZ4sQIuuYPDHdQvf4gyCF9rEEV/yPxGfwPkRodwEgiMUUXTx/dex+Me0wxx53S+NgUHaP7y3MGlDmg==",
       "dev": true,
       "requires": {
-        "string-width": "^1.0.2 || 2"
+        "string-width": "^1.0.2 || 2 || 3 || 4"
       }
     },
     "widest-line": {
@@ -13694,9 +14010,9 @@
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-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
-          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+          "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
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@@ -13712,23 +14028,23 @@
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-          "version": "4.2.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.2.tgz",
-          "integrity": "sha512-XBJbT3N4JhVumXE0eoLU9DCjcaF92KLNqTmFCnG1pf8duUxFGwtP6AD6nkjw9a3IdiRtL3E2w3JDiE/xi3vOeA==",
+          "version": "4.2.3",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+          "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
           "dev": true,
           "requires": {
             "emoji-regex": "^8.0.0",
             "is-fullwidth-code-point": "^3.0.0",
-            "strip-ansi": "^6.0.0"
+            "strip-ansi": "^6.0.1"
           }
         },
         "strip-ansi": {
-          "version": "6.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
-          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "version": "6.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+          "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
           "dev": true,
           "requires": {
-            "ansi-regex": "^5.0.0"
+            "ansi-regex": "^5.0.1"
           }
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@@ -13751,9 +14067,9 @@
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-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-2.0.0.tgz",
-          "integrity": "sha512-XCoy+WlUr7d1+Z8GgSuXmpuUFC9fOhRXglJMx+dwLKTkL44Cjd4W1Z5P+BQZpr+cR93aGP4S/s7Ftw6Nd/kiEw==",
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-2.0.1.tgz",
+          "integrity": "sha512-hFoiJiTl63nn+kstHGBtewWSKnQLpyb155KHheA1l39uvtO9nWIop1p3udqPcUd/xbF1VLMO4n7OI6p7RbngDg==",
           "dev": true
         },
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@@ -13797,9 +14113,9 @@
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-          "version": "5.0.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
-          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+          "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
           "dev": true
         },
         "ansi-styles": {
@@ -13906,12 +14222,6 @@
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       "dev": true
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-    "xmlhttprequest": {
-      "version": "1.8.0",
-      "resolved": "https://registry.npmjs.org/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz",
-      "integrity": "sha1-Z/4HXFwk/vOfnWX197f+dRcZaPw=",
-      "dev": true
-    },
     "xregexp": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-2.0.0.tgz",
@@ -13959,8 +14269,7 @@
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           "version": "5.0.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
-          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "resolved": "",
           "dev": true
         },
         "emoji-regex": {
diff --git a/package.json b/package.json
index 098745b6..775c2001 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "firebaseui",
-  "version": "5.0.0",
+  "version": "6.0.0",
   "description": "Javascript library for customizable UI on top of Firebase SDK",
   "files": [
     "dist/firebaseui.js",
@@ -39,7 +39,7 @@
   "license": "Apache-2.0",
   "devDependencies": {
     "closure-builder": "^2.3.7",
-    "firebase": "^8.2.4",
+    "firebase": "^9.1.3",
     "firebase-tools": "^9.3.0",
     "fs-extra": "^3.0.1",
     "google-closure-compiler": "^20190415.0.0",
@@ -64,6 +64,6 @@
     "material-design-lite": "^1.2.0"
   },
   "peerDependencies": {
-    "firebase": ">=8.2.4"
+    "firebase": "^9.1.3"
   }
 }
